diff --git a/lib/version.h.in b/lib/version.h.in
index 8b8b9f6..a8fc59c 100644
--- a/lib/version.h.in
+++ b/lib/version.h.in
@@ -32,7 +32,7 @@
 
 extern char *host_name;
 
-void print_version(char *);
+void print_version (const char *);
 pid_t pid_output (char *);
 pid_t pid_output_lock (char *);