diff --git a/mlir/include/mlir-c/Support.h b/mlir/include/mlir-c/Support.h
--- a/mlir/include/mlir-c/Support.h
+++ b/mlir/include/mlir-c/Support.h
@@ -15,6 +15,7 @@
 #ifndef MLIR_C_SUPPORT_H
 #define MLIR_C_SUPPORT_H
 
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>