diff --git a/src/openrct2/CMakeLists.txt b/src/openrct2/CMakeLists.txt
index 76a7733eb2..939f6c854f 100644
--- a/src/openrct2/CMakeLists.txt
+++ b/src/openrct2/CMakeLists.txt
@@ -148,7 +148,7 @@ set_property(SOURCE ${CMAKE_CURRENT_LIST_DIR}/Version.cpp
     COMPILE_DEFINITIONS OPENRCT2_BRANCH="${OPENRCT2_BRANCH}")
 if (NOT OPENRCT2_COMMIT_SHA1_SHORT STREQUAL "HEAD")
     set_property(SOURCE ${CMAKE_CURRENT_LIST_DIR}/Version.cpp
-    ${CMAKE_CURRENT_LIST_DIR}/Crash/Platform.cpp PROPERTY
+    ${CMAKE_CURRENT_LIST_DIR}/Crash/Platform.cpp APPEND PROPERTY
     COMPILE_DEFINITIONS OPENRCT2_COMMIT_SHA1_SHORT="${OPENRCT2_COMMIT_SHA1_SHORT}")
 endif()