diff --git a/config.mk b/config.mk
index 0e7ebb9..9febfcc 100644
--- a/config.mk
+++ b/config.mk
@@ -25,7 +25,7 @@ INCS = -I${X11INC} -I${FREETYPEINC}
 LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
 
 # flags
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS} -D_FORTIFY_SURCE=2
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS} -D_FORTIFY_SOURCE=2
 CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Ofast -march=native -mtune=native -fstack-protector -fno-plt ${INCS} ${CPPFLAGS} 
 LDFLAGS  = ${LIBS} -Wl,-O3,-z,now,-z,relro -s