diff --git a/Makefile b/Makefile
index 5cdb743..a82e2e3 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ CFLAGS += -std=c99 -O3 \
 	  -Wconversion \
 	  -Wc++-compat \
 	  -Wbad-function-cast \
+	  -Wunused-macros \
 	  $(shell pkg-config --cflags ${GTK} ${VTE})
 
 LDFLAGS += -s -Wl,--as-needed $(shell pkg-config --libs ${GTK} ${VTE})
diff --git a/termite.c b/termite.c
index 6bffee5..4510a18 100644
--- a/termite.c
+++ b/termite.c
@@ -9,7 +9,6 @@
 #include "config.h"
 
 #define CONCAT(X, Y) X ## Y
-#define CONCAT2(X, Y) CONCAT(X, Y)
 #define KEY(X) CONCAT(GDK_KEY_, X)
 
 #ifndef __GNUC__