diff --git a/src/sbbs3/str_util.c b/src/sbbs3/str_util.c
index 611291c66d3b317b6b7548154d90075779bca62a..ff13347d8f86466d808475b78061e58768fedc02 100644
--- a/src/sbbs3/str_util.c
+++ b/src/sbbs3/str_util.c
@@ -213,7 +213,7 @@ int bstrlen(char *str)
 /* Returns in 'string' a character representation of the number in l with   */
 /* commas.																	*/
 /****************************************************************************/
-char *ultoac(ulong l, char *string)
+char* DLLCALL ultoac(ulong l, char *string)
 {
 	char str[256];
 	int i,j,k;