diff --git a/gmp-glue.c b/gmp-glue.c
index 5e3a9c2ad958fb4c4710120db2e65e0b75b9f2f9..d483d7c491fd08771d91c770ef5e897eb25f13c8 100644
--- a/gmp-glue.c
+++ b/gmp-glue.c
@@ -20,6 +20,10 @@
  * MA 02111-1301, USA.
  */
 
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <assert.h>
 
 #include "gmp-glue.h"