diff --git a/usr/Makefile b/usr/Makefile
index 29f091d..cad4b8b 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -52,9 +52,10 @@ endif
 
 INCLUDES += -I.
 
+OPTFLAGS = -g -O2 -Wall -Wstrict-prototypes -fPIC
 CFLAGS += -D_GNU_SOURCE
 CFLAGS += $(INCLUDES)
-CFLAGS += -g -O2 -Wall -Wstrict-prototypes -fPIC
+CFLAGS += $(OPTFLAGS)
 CFLAGS += -DTGT_VERSION=\"$(VERSION)$(EXTRAVERSION)\"
 
 LIBS += -lpthread