1 files changed, 3 insertions, 1 deletions
diff --git a/src/passes/Vacuum.cpp b/src/passes/Vacuum.cpp
index ca777431a..c9b83da78 100644
--- a/src/passes/Vacuum.cpp
+++ b/src/passes/Vacuum.cpp
@@ -291,7 +291,9 @@ struct Vacuum : public WalkerPass<ExpressionStackWalker<Vacuum>> {
             BranchUtils::BranchSeeker seeker(block->name);
             Expression* temp = block;
             seeker.walk(temp);
-            if (seeker.found && seeker.valueType != Type::none) {
+            Type supertype;
+            if (seeker.found && Type::getSuperType(seeker.types, supertype) &&
+                supertype != Type::none) {
               canPop = false;
             }
           }