diff --git a/examples/point/point.q b/examples/point/point.q
index c2a7d5f..de2a763 100644
--- a/examples/point/point.q
+++ b/examples/point/point.q
@@ -1,7 +1,7 @@
 import mem
 import sys
 
-struct Point {
+Point {
 	x int
 	y int
 }
diff --git a/lib/sys/struct_linux.q b/lib/sys/struct_linux.q
index 8a22345..adbea0d 100644
--- a/lib/sys/struct_linux.q
+++ b/lib/sys/struct_linux.q
@@ -1,11 +1,11 @@
-struct sockaddr_in {
+sockaddr_in {
 	sin_family int16
-	sin_port   int16
-	sin_addr   int64
-	sin_zero   int64
+	sin_port int16
+	sin_addr int64
+	sin_zero int64
 }
 
-struct timespec {
-	seconds     int64
+timespec {
+	seconds int64
 	nanoseconds int64
 }
\ No newline at end of file
diff --git a/lib/sys/struct_mac.q b/lib/sys/struct_mac.q
index 480199a..9172114 100644
--- a/lib/sys/struct_mac.q
+++ b/lib/sys/struct_mac.q
@@ -1,7 +1,7 @@
-struct sockaddr_in_bsd {
-	sin_len    int8
+sockaddr_in_bsd {
+	sin_len int8
 	sin_family int8
-	sin_port   int16
-	sin_addr   int64
-	sin_zero   int64
+	sin_port int16
+	sin_addr int64
+	sin_zero int64
 }
\ No newline at end of file
diff --git a/src/errors/Common.go b/src/errors/Common.go
index f5f4f50..206d4c5 100644
--- a/src/errors/Common.go
+++ b/src/errors/Common.go
@@ -3,11 +3,10 @@ package errors
 var (
 	EmptySwitch                = &Base{"Empty switch"}
 	ExpectedConstName          = &Base{"Expected a name for the const group"}
-	ExpectedFunctionParameters = &Base{"Expected function parameters"}
+	InvalidDefinition          = &Base{"Invalid definition"}
 	ExpectedFunctionDefinition = &Base{"Expected function definition"}
 	ExpectedIfBeforeElse       = &Base{"Expected an 'if' block before 'else'"}
 	ExpectedPackageName        = &Base{"Expected package name"}
-	ExpectedStructName         = &Base{"Expected struct name"}
 	ExpectedDLLName            = &Base{"Expected DLL name"}
 	InvalidNumber              = &Base{"Invalid number"}
 	InvalidCondition           = &Base{"Invalid condition"}
diff --git a/src/scanner/scanFile.go b/src/scanner/scanFile.go
index 04bf2b5..0d9d7a4 100644
--- a/src/scanner/scanFile.go
+++ b/src/scanner/scanFile.go
@@ -31,12 +31,29 @@ func (s *Scanner) scanFile(path string, pkg string) error {
 		switch tokens[i].Kind {
 		case token.NewLine:
 		case token.Comment:
+		case token.Identifier:
+			if i+1 >= len(tokens) {
+				return errors.New(errors.InvalidDefinition, file, tokens[i].End())
+			}
+
+			next := tokens[i+1]
+
+			switch next.Kind {
+			case token.GroupStart:
+				i, err = s.scanFunction(file, tokens, i)
+			case token.BlockStart:
+				i, err = s.scanStruct(file, tokens, i)
+			case token.GroupEnd:
+				return errors.New(errors.MissingGroupStart, file, next.Position)
+			case token.BlockEnd:
+				return errors.New(errors.MissingBlockStart, file, next.Position)
+			case token.Invalid:
+				return errors.New(&errors.InvalidCharacter{Character: next.Text(file.Bytes)}, file, next.Position)
+			default:
+				return errors.New(errors.InvalidDefinition, file, next.Position)
+			}
 		case token.Import:
 			i, err = s.scanImport(file, tokens, i)
-		case token.Struct:
-			i, err = s.scanStruct(file, tokens, i)
-		case token.Identifier:
-			i, err = s.scanFunction(file, tokens, i)
 		case token.Extern:
 			i, err = s.scanExtern(file, tokens, i)
 		case token.Const:
diff --git a/src/scanner/scanFunctionSignature.go b/src/scanner/scanFunctionSignature.go
index 6cd5b17..1833c61 100644
--- a/src/scanner/scanFunctionSignature.go
+++ b/src/scanner/scanFunctionSignature.go
@@ -60,7 +60,7 @@ func scanFunctionSignature(file *fs.File, tokens token.List, i int, delimiter to
 			}
 
 			if paramsStart == -1 {
-				return nil, i, errors.New(errors.ExpectedFunctionParameters, file, tokens[i].Position)
+				return nil, i, errors.New(errors.InvalidDefinition, file, tokens[i].Position)
 			}
 
 			return nil, i, nil
@@ -71,7 +71,7 @@ func scanFunctionSignature(file *fs.File, tokens token.List, i int, delimiter to
 			continue
 		}
 
-		return nil, i, errors.New(errors.ExpectedFunctionParameters, file, tokens[i].Position)
+		return nil, i, errors.New(errors.InvalidDefinition, file, tokens[i].Position)
 	}
 
 	// Return type
diff --git a/src/scanner/scanStruct.go b/src/scanner/scanStruct.go
index 0de75cf..dc70838 100644
--- a/src/scanner/scanStruct.go
+++ b/src/scanner/scanStruct.go
@@ -9,12 +9,6 @@ import (
 
 // scanStruct scans a struct.
 func (s *Scanner) scanStruct(file *fs.File, tokens token.List, i int) (int, error) {
-	i++
-
-	if tokens[i].Kind != token.Identifier {
-		return i, errors.New(errors.ExpectedStructName, file, tokens[i].Position)
-	}
-
 	structName := tokens[i].Text(file.Bytes)
 	structure := types.NewStruct(file.Package, structName)
 
diff --git a/src/token/Kind.go b/src/token/Kind.go
index 881bd18..12d7362 100644
--- a/src/token/Kind.go
+++ b/src/token/Kind.go
@@ -74,7 +74,6 @@ const (
 	Import                            // import
 	Loop                              // loop
 	Return                            // return
-	Struct                            // struct
 	Switch                            // switch
 	___END_KEYWORDS___                // </keywords>
 )
diff --git a/src/token/Tokenize_test.go b/src/token/Tokenize_test.go
index 19ebf16..ce78895 100644
--- a/src/token/Tokenize_test.go
+++ b/src/token/Tokenize_test.go
@@ -25,7 +25,7 @@ func TestFunction(t *testing.T) {
 }
 
 func TestKeyword(t *testing.T) {
-	tokens := token.Tokenize([]byte("assert const else extern if import for loop return struct switch"))
+	tokens := token.Tokenize([]byte("assert const else extern if import for loop return switch"))
 
 	expected := []token.Kind{
 		token.Assert,
@@ -37,7 +37,6 @@ func TestKeyword(t *testing.T) {
 		token.For,
 		token.Loop,
 		token.Return,
-		token.Struct,
 		token.Switch,
 		token.EOF,
 	}
diff --git a/src/token/identifier.go b/src/token/identifier.go
index 27849ed..db48049 100644
--- a/src/token/identifier.go
+++ b/src/token/identifier.go
@@ -31,8 +31,6 @@ func identifier(tokens List, buffer []byte, i Position) (List, Position) {
 		kind = Loop
 	case "return":
 		kind = Return
-	case "struct":
-		kind = Struct
 	case "switch":
 		kind = Switch
 	}
diff --git a/tests/errors/ExpectedStructName.q b/tests/errors/ExpectedStructName.q
deleted file mode 100644
index 6c8a4ee..0000000
--- a/tests/errors/ExpectedStructName.q
+++ /dev/null
@@ -1 +0,0 @@
-struct{}
\ No newline at end of file
diff --git a/tests/errors/ExpectedFunctionParameters.q b/tests/errors/InvalidDefinition.q
similarity index 100%
rename from tests/errors/ExpectedFunctionParameters.q
rename to tests/errors/InvalidDefinition.q
diff --git a/tests/errors/UnknownStructField.q b/tests/errors/UnknownStructField.q
index bea43e5..aefe455 100644
--- a/tests/errors/UnknownStructField.q
+++ b/tests/errors/UnknownStructField.q
@@ -1,4 +1,4 @@
-struct A {}
+A {}
 
 main() {
 	a := new(A)
diff --git a/tests/errors_test.go b/tests/errors_test.go
index 9403bfc..8165e97 100644
--- a/tests/errors_test.go
+++ b/tests/errors_test.go
@@ -17,12 +17,11 @@ var errs = []struct {
 	{"EmptySwitch.q", errors.EmptySwitch},
 	{"ExpectedDLLName.q", errors.ExpectedDLLName},
 	{"ExpectedFunctionDefinition.q", errors.ExpectedFunctionDefinition},
-	{"ExpectedFunctionParameters.q", errors.ExpectedFunctionParameters},
 	{"ExpectedIfBeforeElse.q", errors.ExpectedIfBeforeElse},
 	{"ExpectedIfBeforeElse2.q", errors.ExpectedIfBeforeElse},
-	{"ExpectedStructName.q", errors.ExpectedStructName},
 	{"ExpectedPackageName.q", errors.ExpectedPackageName},
 	{"InvalidCondition.q", errors.InvalidCondition},
+	{"InvalidDefinition.q", errors.InvalidDefinition},
 	{"InvalidInstructionCall.q", &errors.InvalidInstruction{Instruction: "sys.write"}},
 	{"InvalidInstructionExpression.q", &errors.InvalidInstruction{Instruction: "2+3"}},
 	{"InvalidInstructionIdentifier.q", &errors.InvalidInstruction{Instruction: "abc"}},
diff --git a/tests/programs/allocator.q b/tests/programs/allocator.q
index 4b39208..ba9c959 100644
--- a/tests/programs/allocator.q
+++ b/tests/programs/allocator.q
@@ -24,12 +24,12 @@ main() {
 	assert b.y == 4
 }
 
-struct Allocator {
+Allocator {
 	block *any
 	current int
 }
 
-struct Point {
+Point {
 	x int
 	y int
 }
\ No newline at end of file
diff --git a/tests/programs/function-pointer-field.q b/tests/programs/function-pointer-field.q
index 1484842..f37d9c9 100644
--- a/tests/programs/function-pointer-field.q
+++ b/tests/programs/function-pointer-field.q
@@ -1,6 +1,6 @@
 import sys
 
-struct Struct {
+Struct {
 	func *any
 }
 
diff --git a/tests/programs/struct-lifetime.q b/tests/programs/struct-lifetime.q
index a32f469..920ffc4 100644
--- a/tests/programs/struct-lifetime.q
+++ b/tests/programs/struct-lifetime.q
@@ -3,6 +3,6 @@ main() {
 	c.value += 16
 }
 
-struct Counter {
+Counter {
 	value int
 }
\ No newline at end of file
diff --git a/tests/programs/struct.q b/tests/programs/struct.q
index dd23388..15f096e 100644
--- a/tests/programs/struct.q
+++ b/tests/programs/struct.q
@@ -1,4 +1,4 @@
-struct Point {
+Point {
 	x int
 	y int
 }