diff --git a/src/tool_setopt.c b/src/tool_setopt.c
index b9c3054703..196affc042 100644
--- a/src/tool_setopt.c
+++ b/src/tool_setopt.c
@@ -31,6 +31,7 @@
 #include "tool_easysrc.h"
 #include "tool_setopt.h"
 #include "tool_convert.h"
+#include "tool_msgs.h"
 
 #include "memdebug.h" /* keep this as LAST include */
 
@@ -315,7 +316,11 @@ CURLcode tool_setopt_enum(CURL *curl, struct GlobalConfig *config,
     }
   }
 
- nomem:
+#ifdef DEBUGBUILD
+  if(ret)
+    warnf(config, "option %s returned error (%d)\n", name, (int)ret);
+#endif
+  nomem:
   return ret;
 }