Index: src/runtime/exception.m
==================================================================
--- src/runtime/exception.m
+++ src/runtime/exception.m
@@ -425,11 +425,11 @@
 
 	return false;
 #else
 	uintptr_t callsite_landingpad, callsite_action;
 
-	if ((uintptr_t)ip < 1)
+	if ((intptr_t)ip < 1)
 		return false;
 
 	do {
 		callsite_landingpad = (uintptr_t)read_uleb128(&ptr);
 		callsite_action = (uintptr_t)read_uleb128(&ptr);