diff --git a/test/gfx/rgbgfx_test.cpp b/test/gfx/rgbgfx_test.cpp
index e2bcd7a1..68b4d266 100644
--- a/test/gfx/rgbgfx_test.cpp
+++ b/test/gfx/rgbgfx_test.cpp
@@ -5,6 +5,7 @@
 	#include <sys/stat.h>
 	#include <sys/wait.h>
 
+	#include <signal.h>
 	#include <spawn.h>
 	#include <unistd.h>
 #else