diff --git a/gsw_check_functions.c b/gsw_check_functions.c
index de63d5f..0c9fe13 100644
--- a/gsw_check_functions.c
+++ b/gsw_check_functions.c
@@ -660,7 +660,7 @@ report(const char *funcname, const char *varname, gsw_error_info *errs)
             }
             strcat(message, ")");
         }
-        sprintf(infoflg,"(%s%3d)",(errs->flags & GSW_ERROR_LIMIT_FLAG)?"*":"",
+        snprintf(infoflg, sizeof(infoflg), "(%s%3d)", (errs->flags & GSW_ERROR_LIMIT_FLAG)?"*":"",
                 errs->ncomp);
         ndots = 65 - strlen(message);
         if (errs->flags & GSW_ERROR_ERROR_FLAG) {