diff --git a/src/build/Build.go b/src/build/Build.go
index eea57f0..f73045a 100644
--- a/src/build/Build.go
+++ b/src/build/Build.go
@@ -7,7 +7,6 @@ import (
 
 	"git.akyoto.dev/cli/q/src/compiler"
 	"git.akyoto.dev/cli/q/src/elf"
-	"git.akyoto.dev/cli/q/src/errors"
 )
 
 // Build describes a compiler build.
@@ -26,16 +25,6 @@ func New(directory string) *Build {
 
 // Run parses the input files and generates an executable file.
 func (build *Build) Run() error {
-	stat, err := os.Stat(build.Directory)
-
-	if err != nil {
-		return err
-	}
-
-	if !stat.IsDir() {
-		return &errors.InvalidDirectory{Path: build.Directory}
-	}
-
 	functions, err := compiler.Compile(build.Directory)
 
 	if err != nil {
diff --git a/src/compiler/Scan.go b/src/compiler/Scan.go
index 4e55afd..1c52ba4 100644
--- a/src/compiler/Scan.go
+++ b/src/compiler/Scan.go
@@ -28,7 +28,7 @@ func Scan(path string) (<-chan *Function, <-chan error) {
 func scan(path string, functions chan<- *Function, errors chan<- error) {
 	wg := sync.WaitGroup{}
 
-	directory.Walk(path, func(name string) {
+	err := directory.Walk(path, func(name string) {
 		if !strings.HasSuffix(name, ".q") {
 			return
 		}
@@ -46,6 +46,10 @@ func scan(path string, functions chan<- *Function, errors chan<- error) {
 		}()
 	})
 
+	if err != nil {
+		errors <- err
+	}
+
 	wg.Wait()
 }
 
diff --git a/src/directory/Walk.go b/src/directory/Walk.go
index f871c64..e2cc495 100644
--- a/src/directory/Walk.go
+++ b/src/directory/Walk.go
@@ -9,11 +9,11 @@ const blockSize = 4096
 
 // Walk calls your callback function for every file name inside the directory.
 // It doesn't distinguish between files and directories.
-func Walk(directory string, callBack func(string)) {
+func Walk(directory string, callBack func(string)) error {
 	fd, err := syscall.Open(directory, 0, 0)
 
 	if err != nil {
-		panic(err)
+		return err
 	}
 
 	defer syscall.Close(fd)
@@ -23,7 +23,7 @@ func Walk(directory string, callBack func(string)) {
 		n, err := syscall.ReadDirent(fd, buffer)
 
 		if err != nil {
-			panic(err)
+			return err
 		}
 
 		if n <= 0 {
@@ -58,4 +58,6 @@ func Walk(directory string, callBack func(string)) {
 			}
 		}
 	}
+
+	return nil
 }