diff --git a/source/opt/ir_context.cpp b/source/opt/ir_context.cpp
index fe69027..a31349f 100644
--- a/source/opt/ir_context.cpp
+++ b/source/opt/ir_context.cpp
@@ -127,6 +127,9 @@
     constant_mgr_.reset(nullptr);
   }
   if (analyses_to_invalidate & kAnalysisTypes) {
+    // The ConstantManager contains Type pointers. If the TypeManager goes
+    // away, the ConstantManager has to go away.
+    constant_mgr_.reset(nullptr);
     type_mgr_.reset(nullptr);
   }