diff --git a/CMakeLists.txt b/CMakeLists.txt
index e60b6cb..ea96db6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,12 +30,8 @@ set(CTR_VERSION_MINOR  7)
 set(CTR_VERSION_PATCH  1)
 set(CTR_VERSION_STR "${CTR_VERSION_MAJOR}.${CTR_VERSION_MINOR}.${CTR_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 "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
-endif()
+# Define __CTR_FILENAME__
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__CTR_FILENAME__=__FILE__")
 
 # Configuration options
 option(CTR_DEV             "Enable development mode"                   No)
diff --git a/include/ctraces/ctr_log.h b/include/ctraces/ctr_log.h
index c4aae2a..392a93c 100644
--- a/include/ctraces/ctr_log.h
+++ b/include/ctraces/ctr_log.h
@@ -38,27 +38,27 @@ void ctr_log_print(void *ctx, int level, const char *file, int line,
 int ctr_errno_print(int errnum, const char *file, int line);
 
 #define ctr_log_error(ctx, fmt, ...)                    \
-    ctr_log_print(ctx, CTR_LOG_ERROR, __FILENAME__,     \
+    ctr_log_print(ctx, CTR_LOG_ERROR, __CTR_FILENAME__, \
                   __LINE__, fmt, ##__VA_ARGS__)
 
 #define ctr_log_warn(ctx, fmt, ...)                 \
-    ctr_log_print(ctx, CTR_LOG_WARN, __FILENAME__,  \
+    ctr_log_print(ctx, CTR_LOG_WARN, __CTR_FILENAME__, \
                   __LINE__, fmt, ##__VA_ARGS__)
 
 #define ctr_log_info(ctx, fmt, ...)                 \
-    ctr_log_print(ctx, CTR_LOG_INFO, __FILENAME__,  \
+    ctr_log_print(ctx, CTR_LOG_INFO, __CTR_FILENAME__, \
                   __LINE__, fmt, ##__VA_ARGS__)
 
 #define ctr_log_debug(ctx, fmt, ...)                \
-    ctr_log_print(ctx, CTR_LOG_DEBUG, __FILENAME__, \
+    ctr_log_print(ctx, CTR_LOG_DEBUG, __CTR_FILENAME__, \
                   __LINE__, fmt, ##__VA_ARGS__)
 
 #define ctr_log_trace(ctx, fmt, ...)                \
-    ctr_log_print(ctx, CTR_LOG_TRACE, __FILENAME__, \
+    ctr_log_print(ctx, CTR_LOG_TRACE, __CTR_FILENAME__, \
                   __LINE__, fmt, ##__VA_ARGS__)
 
-#ifdef __FILENAME__
-#define ctr_errno() ctr_errno_print(errno, __FILENAME__, __LINE__)
+#ifdef __CTR_FILENAME__
+#define ctr_errno() ctr_errno_print(errno, __CTR_FILENAME__, __LINE__)
 #else
 #define ctr_errno() ctr_errno_print(errno, __FILE__, __LINE__)
 #endif