diff --git a/crypto/x509v3/v3err.c b/crypto/x509v3/v3err.c
index febd36dfc..a00dda754 100644
--- a/crypto/x509v3/v3err.c
+++ b/crypto/x509v3/v3err.c
@@ -151,7 +151,7 @@ static ERR_STRING_DATA X509V3_str_reasons[]=
 
 #endif
 
-void ERR_load_X509V3_strings()
+void ERR_load_X509V3_strings(void)
 	{
 	static int init=1;