diff --git a/include/share/compat.h b/include/share/compat.h
index c6231acc..dfe5f4d1 100644
--- a/include/share/compat.h
+++ b/include/share/compat.h
@@ -69,7 +69,9 @@
 #endif
 
 #if HAVE_INTTYPES_H
+#ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
+#endif
 #include <inttypes.h>
 #endif