diff --git a/mlir/include/mlir/Interfaces/CallInterfaces.h b/mlir/include/mlir/Interfaces/CallInterfaces.h
--- a/mlir/include/mlir/Interfaces/CallInterfaces.h
+++ b/mlir/include/mlir/Interfaces/CallInterfaces.h
@@ -28,4 +28,12 @@
 /// Include the generated interface declarations.
 #include "mlir/Interfaces/CallInterfaces.h.inc"
 
+namespace llvm {
+
+template <typename To>
+struct CastInfo<To, mlir::CallInterfaceCallable>
+    : public CastInfo<To, mlir::CallInterfaceCallable::PointerUnion> {};
+
+} // namespace llvm
+
 #endif // MLIR_INTERFACES_CALLINTERFACES_H
diff --git a/mlir/lib/Interfaces/CallInterfaces.cpp b/mlir/lib/Interfaces/CallInterfaces.cpp
--- a/mlir/lib/Interfaces/CallInterfaces.cpp
+++ b/mlir/lib/Interfaces/CallInterfaces.cpp
@@ -21,7 +21,7 @@
 Operation *
 CallOpInterface::resolveCallable(SymbolTableCollection *symbolTable) {
   CallInterfaceCallable callable = getCallableForCallee();
-  if (auto symbolVal = callable.dyn_cast<Value>())
+  if (auto symbolVal = dyn_cast<Value>(callable))
     return symbolVal.getDefiningOp();
 
   // If the callable isn't a value, lookup the symbol reference.
diff --git a/mlir/lib/Transforms/Inliner.cpp b/mlir/lib/Transforms/Inliner.cpp
--- a/mlir/lib/Transforms/Inliner.cpp
+++ b/mlir/lib/Transforms/Inliner.cpp
@@ -344,7 +344,7 @@
       if (auto call = dyn_cast<CallOpInterface>(op)) {
         // TODO: Support inlining nested call references.
         CallInterfaceCallable callable = call.getCallableForCallee();
-        if (SymbolRefAttr symRef = callable.dyn_cast<SymbolRefAttr>()) {
+        if (SymbolRefAttr symRef = dyn_cast<SymbolRefAttr>(callable)) {
           if (!symRef.isa<FlatSymbolRefAttr>())
             continue;
         }