diff --git a/mlir/lib/CAPI/Interfaces/Interfaces.cpp b/mlir/lib/CAPI/Interfaces/Interfaces.cpp
index f752a57b5857..3f1155fe1ff4 100644
--- a/mlir/lib/CAPI/Interfaces/Interfaces.cpp
+++ b/mlir/lib/CAPI/Interfaces/Interfaces.cpp
@@ -9,6 +9,7 @@
 #include "mlir-c/Interfaces.h"
 
 #include "mlir/CAPI/IR.h"
+#include "mlir/CAPI/Support.h"
 #include "mlir/CAPI/Wrap.h"
 #include "mlir/Interfaces/InferTypeOpInterface.h"
 #include "llvm/ADT/ScopeExit.h"