diff --git a/config.pri b/config.pri
index 3fe09a27..14af1b2e 100644
--- a/config.pri
+++ b/config.pri
@@ -5,8 +5,7 @@
 CONFIG += c++17
 win32:QMAKE_CXXFLAGS += /std:c++17 #enable c++17 explicitly in msvc
 
-unix:QMAKE_CXXFLAGS_RELEASE += -DNDEBUG
-mingw:QMAKE_CXXFLAGS_RELEASE += -DNDEBUG
+if(unix|mingw):QMAKE_CXXFLAGS_RELEASE += -DNDEBUG
 win32:msvc:QMAKE_CXXFLAGS_RELEASE += /DNDEBUG
 
 # check Qt version