diff --git a/CMakeLists.txt b/CMakeLists.txt
index 97ccaf16af0..270e5d28f42 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,11 +46,7 @@ else()
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 endif()
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
-else()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
-endif()
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
 
 if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "armv7l")
   set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -latomic")
diff --git a/lib/chunkio/CMakeLists.txt b/lib/chunkio/CMakeLists.txt
index bbe1f39cb75..809ea93037c 100644
--- a/lib/chunkio/CMakeLists.txt
+++ b/lib/chunkio/CMakeLists.txt
@@ -14,12 +14,7 @@ else()
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall ")
 endif()
 
-# Set __FILENAME__
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
-else()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
-endif()
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
 
 include(cmake/macros.cmake)
 
diff --git a/lib/cmetrics/CMakeLists.txt b/lib/cmetrics/CMakeLists.txt
index 60e8774bbd4..e3d614946c0 100644
--- a/lib/cmetrics/CMakeLists.txt
+++ b/lib/cmetrics/CMakeLists.txt
@@ -34,12 +34,7 @@ set(CMT_VERSION_MINOR  3)
 set(CMT_VERSION_PATCH  5)
 set(CMT_VERSION_STR "${CMT_VERSION_MAJOR}.${CMT_VERSION_MINOR}.${CMT_VERSION_PATCH}")
 
-# Define __FILENAME__ consistently across Operating Systems
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
-else()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
-endif()
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
 
 # Configuration options
 option(CMT_DEV             "Enable development mode"                   No)