diff --git a/src/include/config.h.in b/src/include/config.h.in
index ce01ecd0a2f..41468c1d352 100644
--- a/src/include/config.h.in
+++ b/src/include/config.h.in
@@ -237,7 +237,7 @@ extern long random(void);
 /* Set to 1 if you have srandom() */
 #undef HAVE_SRANDOM
 #ifndef HAVE_SRANDOM
-extern void srandom(int seed);
+extern void srandom(unsigned int seed);
 #endif
 
 /* Set to 1 if you have libreadline.a */