diff --git a/src/cjson/fpconv.c b/src/cjson/fpconv.c
index b2f7a214c2..0ef7f18cbe 100644
--- a/src/cjson/fpconv.c
+++ b/src/cjson/fpconv.c
@@ -202,7 +202,7 @@ int fpconv_g_fmt(char *str, double num, int precision)
     return len;
 }
 
-void fpconv_init()
+void fpconv_init(void)
 {
     fpconv_update_locale();
 }