diff --git a/mlir/include/mlir/Dialect/Linalg/Transforms/BufferizableOpInterface.h b/mlir/include/mlir/Dialect/Linalg/Transforms/BufferizableOpInterface.h
--- a/mlir/include/mlir/Dialect/Linalg/Transforms/BufferizableOpInterface.h
+++ b/mlir/include/mlir/Dialect/Linalg/Transforms/BufferizableOpInterface.h
@@ -18,7 +18,7 @@
 class BlockAndValueMapping;
 
 namespace linalg {
-class AllocationCallbacks;
+struct AllocationCallbacks;
 class BufferizationAliasInfo;
 
 /// Specify fine-grain relationship between buffers to enable more analysis.