diff --git a/libasn1compiler/asn1c_constraint.c b/libasn1compiler/asn1c_constraint.c
index 6fe896f..8404e90 100644
--- a/libasn1compiler/asn1c_constraint.c
+++ b/libasn1compiler/asn1c_constraint.c
@@ -705,7 +705,7 @@
 	&& r->left.value >= 0
 	&& r->right.type == ARE_VALUE
 	&& r->right.value > 2147483647
-	&& r->right.value <= 4294967295UL) {
+	&& r->right.value <= (asn1c_integer_t)(4294967295UL)) {
 		if(r->el_count == 0
 		&& r->left.value == 0
 		&& r->right.value == 4294967295UL)