diff --git a/main.go b/main.go
index 1072107..87a4c1d 100644
--- a/main.go
+++ b/main.go
@@ -298,9 +298,9 @@ func build(inputFile, outputFile string, keepAsm, noCBM bool) error {
 		return err
 	}
 	
-	// Create temporary assembly file
-	tempDir := os.TempDir()
-	asmFile := filepath.Join(tempDir, "c65gm_"+filepath.Base(inputFile)+".asm")
+	// Assembly file sits in current directory for easy inspection
+	base := strings.TrimSuffix(filepath.Base(inputFile), filepath.Ext(inputFile))
+	asmFile := base + ".asm"
 	
 	// Compile to assembly
 	if err := compileOnly(inputFile, asmFile); err != nil {
@@ -312,9 +312,11 @@ func build(inputFile, outputFile string, keepAsm, noCBM bool) error {
 		return fmt.Errorf("assembly failed: %w", err)
 	}
 	
-	// Clean up temporary assembly file unless requested to keep it
+	// Remove assembly file unless requested to keep it
 	if !keepAsm {
-		os.Remove(asmFile)
+		if err := os.Remove(asmFile); err != nil {
+			return fmt.Errorf("failed to remove assembly file: %w", err)
+		}
 	} else {
 		fmt.Printf("Intermediate assembly file kept: %s\n", asmFile)
 	}