diff --git a/lib/Parse/CMakeLists.txt b/lib/Parse/CMakeLists.txt
index f7ca9b61f9f9b..f48eebf993067 100644
--- a/lib/Parse/CMakeLists.txt
+++ b/lib/Parse/CMakeLists.txt
@@ -74,4 +74,9 @@ if (SWIFT_SWIFT_PARSER)
   )
 endif()
 
+if(SWIFT_COMPILER_VERSION)
+  set_property(SOURCE ParseVersion.cpp APPEND_STRING PROPERTY COMPILE_FLAGS
+    " -DSWIFT_COMPILER_VERSION=\"\\\"${SWIFT_COMPILER_VERSION}\\\"\"")
+endif()
+
 set_swift_llvm_is_available(swiftParse)