diff --git a/src/os_amiga.c b/src/os_amiga.c
index 37c5c94..3728beb 100644
--- a/src/os_amiga.c
+++ b/src/os_amiga.c
@@ -799,7 +799,7 @@
 /*
  * Create directory "name".
  */
-    void
+    int
 mch_mkdir(name)
     char_u	*name;
 {
@@ -807,7 +807,11 @@
 
     lock = CreateDir(name);
     if (lock != NULL)
+    {
 	UnLock(lock);
+	return 0;
+    }
+    return -1;
 }
 
 /*