diff --git a/bacnet-stack/src/filename.c b/bacnet-stack/src/filename.c
index f592b698..08ab11b6 100644
--- a/bacnet-stack/src/filename.c
+++ b/bacnet-stack/src/filename.c
@@ -37,7 +37,7 @@
 char *filename_remove_path(
     const char *filename_in)
 {
-    char *filename_out = filename_in;
+    char *filename_out = (char *)filename_in;
 
     /* allow the device ID to be set */
     if (filename_in) {