diff --git a/otk/util.cc b/otk/util.cc
index 16703247..a2b784e7 100644
--- a/otk/util.cc
+++ b/otk/util.cc
@@ -7,6 +7,10 @@
 extern "C" {
 #include <X11/Xatom.h>
 
+#ifdef HAVE_STDIO_H
+#include <stdio.h>
+#endif
+
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif