diff --git a/src/include/libpq/crypt.h b/src/include/libpq/crypt.h
index 45600394e037961f144e57e89e2f91faaccf0ffc..928ff86a9c43c71c2be53f34c115a2c031fc4408 100644
--- a/src/include/libpq/crypt.h
+++ b/src/include/libpq/crypt.h
@@ -20,7 +20,7 @@ extern char**     pwd_cache;
 extern int        pwd_cache_count;
 
 extern char* crypt_getpwdfilename(void);
-extern char* crypt_getpwdreloadfilename();
+extern char* crypt_getpwdreloadfilename(void);
 extern MsgType crypt_salt(const char* user);
 extern int crypt_verify(Port* port, const char* user, const char* pgpass);