diff --git a/rostests/winetests/CMakeLists.txt b/rostests/winetests/CMakeLists.txt
index 195194d96f6..ca9b37a40bb 100644
--- a/rostests/winetests/CMakeLists.txt
+++ b/rostests/winetests/CMakeLists.txt
@@ -1,4 +1,6 @@
 
+add_definitions(-D__ROS_LONG64__)
+
 add_subdirectory(advapi32)
 add_subdirectory(advpack)
 add_subdirectory(amstream)