diff --git a/glx/glxdriswrast.c b/glx/glxdriswrast.c
index 5b3ecb077..de89d381e 100644
--- a/glx/glxdriswrast.c
+++ b/glx/glxdriswrast.c
@@ -55,6 +55,13 @@
 #include "dispatch.h"
 #include "extension_string.h"
 
+/* RTLD_LOCAL is not defined on Cygwin */
+#ifdef __CYGWIN__
+#ifndef RTLD_LOCAL
+#define RTLD_LOCAL 0
+#endif
+#endif
+
 typedef struct __GLXDRIscreen   __GLXDRIscreen;
 typedef struct __GLXDRIcontext  __GLXDRIcontext;
 typedef struct __GLXDRIdrawable __GLXDRIdrawable;