diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6583856..3fb5c55 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,12 +60,8 @@ if(NOT MSVC)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 endif()
 
-# Define __CMT_FILENAME__ consistently across Operating Systems
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__CMT_FILENAME__='\"$$(subst ${CMAKE_SOURCE_DIR}/,,$$(abspath $$<))\"'")
-else()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__CMT_FILENAME__=__FILE__")
-endif()
+# Define __CMT_FILENAME__
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__CMT_FILENAME__=__FILE__")
 
 # Configuration options
 option(CMT_DEV                       "Enable development mode"                   No)