diff --git a/config/qt4.m4 b/config/qt4.m4
index 8277692c37..aa44d0cd9b 100644
--- a/config/qt4.m4
+++ b/config/qt4.m4
@@ -164,7 +164,7 @@ AC_DEFUN([QT4_DO_PKG_CONFIG],
         	AC_SUBST(QT4_VERSION)
                 QT4_LIB=`$PKG_CONFIG --libs-only-l QtCore QtGui`
                 AC_SUBST(QT4_LIB)
-        	QT4_CPPFLAGS="-DQT_CLEAN_NAMESPACE -DQT_GENUINE_STR -DQT_NO_STL -DQT3_SUPPORT -DQT_NO_KEYWORDS"
+        	QT4_CPPFLAGS="-DQT_CLEAN_NAMESPACE -DQT_GENUINE_STR -DQT_NO_STL -DQT_NO_KEYWORDS"
 	        case ${host} in
 	                *mingw*) QT4_CPPFLAGS="-DQT_DLL $QT4_CPPFLAGS";;
 	        esac
@@ -225,7 +225,7 @@ AC_DEFUN([QT4_DO_MANUAL_CONFIG],
 	AC_SUBST(QT4_LDFLAGS)
 
 	dnl Preprocessor flags
-	QT4_CPPFLAGS="-DQT_CLEAN_NAMESPACE -DQT_GENUINE_STR -DQT_NO_STL -DQT3_SUPPORT -DQT_NO_KEYWORDS"
+	QT4_CPPFLAGS="-DQT_CLEAN_NAMESPACE -DQT_GENUINE_STR -DQT_NO_STL -DQT_NO_KEYWORDS"
 	case ${host} in
 	*mingw*) QT4_CPPFLAGS="-DQT_DLL $QT4_CPPFLAGS";;
 	esac