diff --git a/src/MyFirstUDRKit.cpp b/src/MyFirstUDRKit.cpp
index 089e23c..8a59269 100644
--- a/src/MyFirstUDRKit.cpp
+++ b/src/MyFirstUDRKit.cpp
@@ -143,7 +143,7 @@ FB_UDR_BEGIN_FUNCTION(MFK_flagged)
 //  if ( flags == NULL ) {
 //    return 0;
 //  }
-		if ( in->flagsNull ) {
+		if ( in->flagsNull != 0 ) {
 			out->resultNull = FB_TRUE;
 			out->result = 0;
 		}
@@ -182,7 +182,7 @@ FB_UDR_MESSAGE(OutMessage,
 FB_UDR_EXECUTE_FUNCTION
 {
 	// Test Input
-	if (in->afilenameNull || in->ablobcallbackNull /* || in->ablobcallback.blob_handle == NULL */ ) {
+	if ((in->afilenameNull != 0) || in->ablobcallbackNull != 0 /* || in->ablobcallback.blob_handle == NULL */ ) {
 		out->resultNull = FB_TRUE;
 		out->result = 0;
 	}