diff --git a/mkspecs/features/functions.prf b/mkspecs/features/functions.prf
index 7e801bcfa0f35eb5d604211a0408231de2ee15d0..c15b5118d92ead44b79405458cee8d08487a848d 100644
--- a/mkspecs/features/functions.prf
+++ b/mkspecs/features/functions.prf
@@ -106,6 +106,11 @@ defineReplace(gnOS) {
     return(unknown)
 }
 
+defineTest(isDeveloperBuild) {
+    qtConfig(private_tests): return(true) # enabled for developer-build
+    return(false)
+}
+
 defineTest(skipBuild) {
     skipBuildReason = "$$skipBuildReason $${EOL}$$1"
     export(skipBuildReason)