diff --git a/include/llvm/Config/llvm-config.h.cmake b/include/llvm/Config/llvm-config.h.cmake
index 58111644ffa..bda5eaf512d 100644
--- a/include/llvm/Config/llvm-config.h.cmake
+++ b/include/llvm/Config/llvm-config.h.cmake
@@ -95,4 +95,6 @@
 /* Define if we link Polly to the tools */
 #cmakedefine LINK_POLLY_INTO_TOOLS
 
+#cmakedefine MONO_API_VERSION 4
+
 #endif