diff --git a/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h b/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h
--- a/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h
+++ b/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h
@@ -348,7 +348,7 @@
 
   /// Returns the `DeclContext` of the block being analysed, if any. Otherwise,
   /// returns null.
-  const DeclContext *getDeclCtx() { return CallStack.back(); }
+  const DeclContext *getDeclCtx() const { return CallStack.back(); }
 
   /// Returns whether this `Environment` can be extended to analyze the given
   /// `Callee` (i.e. if `pushCall` can be used), with recursion disallowed and a