diff --git a/opengl/include/EGL/eglext.h b/opengl/include/EGL/eglext.h
index b2abdb1..ccba432 100644
--- a/opengl/include/EGL/eglext.h
+++ b/opengl/include/EGL/eglext.h
@@ -545,7 +545,7 @@
 #define EGL_SYNC_NATIVE_FENCE_ANDROID		0x3144
 #define EGL_SYNC_NATIVE_FENCE_FD_ANDROID	0x3145
 #define EGL_SYNC_NATIVE_FENCE_SIGNALED_ANDROID	0x3146
-#define EGL_NO_NATIVE_FENCE_FD_ANDROID		-1
+#define EGL_NO_NATIVE_FENCE_FD_ANDROID		(-1)
 #ifdef EGL_EGLEXT_PROTOTYPES
 EGLAPI EGLint EGLAPIENTRY eglDupNativeFenceFDANDROID( EGLDisplay dpy, EGLSyncKHR);
 #endif /* EGL_EGLEXT_PROTOTYPES */