diff --git a/pkg/compiler/backend/simpledocker.go b/pkg/compiler/backend/simpledocker.go
index 9060a94e..154d58ba 100644
--- a/pkg/compiler/backend/simpledocker.go
+++ b/pkg/compiler/backend/simpledocker.go
@@ -97,7 +97,7 @@ func (*SimpleDocker) ImageExists(imagename string) bool {
 	out, err := cmd.CombinedOutput()
 	if err != nil {
 		Warning("Image not present")
-		Debug(out)
+		Debug(string(out))
 		return false
 	}
 	return true