diff --git a/mkspecs/features/config.pri b/mkspecs/features/config.pri
index c72278fa7..38a58d9a1 100644
--- a/mkspecs/features/config.pri
+++ b/mkspecs/features/config.pri
@@ -12,6 +12,7 @@ BLACK_CONFIG    += FS9
 BLACK_CONFIG    += FSX
 BLACK_CONFIG    += XPlane
 BLACK_CONFIG    += ProfileRelease
+BLACK_CONFIG    += AssertsInRelease
 BLACK_CONFIG    += PackageInstaller
 #BLACK_CONFIG    += Static
 #BLACK_CONFIG    += Doxygen
diff --git a/mkspecs/features/defines.pri b/mkspecs/features/defines.pri
index f9038d5d5..8dba21926 100644
--- a/mkspecs/features/defines.pri
+++ b/mkspecs/features/defines.pri
@@ -12,3 +12,4 @@ contains(BLACK_CONFIG, FSX) { DEFINES += WITH_FSX }
 contains(BLACK_CONFIG, FS9) { DEFINES += WITH_FS9 }
 contains(BLACK_CONFIG, XPlane) { DEFINES += WITH_XPLANE }
 contains(BLACK_CONFIG, Static) { DEFINES += WITH_STATIC }
+contains(BLACK_CONFIG, AssertsInRelease) { DEFINES += QT_FORCE_ASSERTS }