diff --git a/import_obfuscation.go b/import_obfuscation.go
index 7fddad6..249ccfd 100644
--- a/import_obfuscation.go
+++ b/import_obfuscation.go
@@ -67,6 +67,7 @@ func appendPrivateNameMap(pkg *goobj2.Package, nameMap map[string]string) error
 	return nil
 }
 
+// extractDebugObfSrc extracts obfuscated sources from object files if -debugdir flag is enabled.
 func extractDebugObfSrc(pkgPath string, pkg *goobj2.Package) error {
 	if envGarbleDebugDir == "" {
 		return nil
@@ -90,6 +91,7 @@ func extractDebugObfSrc(pkgPath string, pkg *goobj2.Package) error {
 		return err
 	}
 
+	// ArchiveHeader.Size incorrect, work around https://github.com/Binject/debug/issues/14
 	archiveSize, err := strconv.Atoi(archiveMember.ArchiveHeader.Date)
 	if err != nil {
 		return err
@@ -122,7 +124,9 @@ func extractDebugObfSrc(pkgPath string, pkg *goobj2.Package) error {
 		if _, err := io.Copy(debugFile, tarReader); err != nil {
 			return err
 		}
-		debugFile.Close()
+		if err := debugFile.Close(); err != nil {
+			return err
+		}
 
 		obfuscationTime := header.ModTime.Local()
 
diff --git a/main.go b/main.go
index 63d85b2..cef2e83 100644
--- a/main.go
+++ b/main.go
@@ -738,7 +738,7 @@ func transformCompile(args []string) ([]string, error) {
 		if err := obfSrcTarWriter.WriteHeader(&tar.Header{
 			Name:    name,
 			Mode:    0o755,
-			ModTime: time.Now(), // Need for restore obfuscation time
+			ModTime: time.Now(), // Need for restoring obfuscation time
 			Size:    int64(obfSrc.Len()),
 		}); err != nil {
 			return nil, err
diff --git a/testdata/scripts/debugdir.txt b/testdata/scripts/debugdir.txt
index 164d3ad..45dffaf 100644
--- a/testdata/scripts/debugdir.txt
+++ b/testdata/scripts/debugdir.txt
@@ -1,6 +1,4 @@
 env GOPRIVATE=test/main
-# Isolate go cache for test reproducibility
-env GOCACHE=$WORK/.temp-cache
 
 garble -debugdir ./test1 build
 exists 'test1/test/main/imported/imported.go' 'test1/main/main.go'
@@ -10,6 +8,7 @@ exists 'test1/test/main/imported/imported.go' 'test1/main/main.go'
 
 [short] stop
 
+# Sources from previous builds should be deleted
 cp $WORK/test1/main/main.go $WORK/test1/some_file_from_prev_build.go
 
 garble -debugdir ./test1 build -v