diff --git a/mkspecs/common/gcc-base.conf b/mkspecs/common/gcc-base.conf
index 44b42672079..4d82321cba8 100644
--- a/mkspecs/common/gcc-base.conf
+++ b/mkspecs/common/gcc-base.conf
@@ -38,7 +38,7 @@ QMAKE_CFLAGS_OPTIMIZE_SIZE = -Os
 
 !equals(QMAKE_HOST.os, Windows): QMAKE_CFLAGS += -pipe
 QMAKE_CFLAGS_DEPS          += -M
-QMAKE_CFLAGS_WARN_ON       += -Wall -W
+QMAKE_CFLAGS_WARN_ON       += -Wall -Wextra
 QMAKE_CFLAGS_WARN_OFF      += -w
 QMAKE_CFLAGS_RELEASE       += $$QMAKE_CFLAGS_OPTIMIZE
 QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g