diff --git a/lib/whereami/CMakeLists.txt b/lib/whereami/CMakeLists.txt
index 22e1646..e352523 100644
--- a/lib/whereami/CMakeLists.txt
+++ b/lib/whereami/CMakeLists.txt
@@ -5,14 +5,6 @@ set(LIBARY_NAME ${PROJECT_NAME})
 # Create static library
 add_library(${LIBARY_NAME} STATIC whereami.c whereami.h)
 
-# Add X/Open definition for realpath
-#target_compile_definitions(${LIBARY_NAME} PUBLIC _XOPEN_SOURCE=500)
-
-# MacOS specific compile flag
-#if(APPLE)
-#    target_compile_definitions(${LIBARY_NAME} PUBLIC _DARWIN_C_SOURCE)
-#endif()
-
 # Use PUBLIC iso INTERFACE, so the library itself also finds it's own header file
 target_include_directories(
     ${LIBARY_NAME}
diff --git a/lib/whereami/whereami.c b/lib/whereami/whereami.c
index 05874bc..97f7f85 100644
--- a/lib/whereami/whereami.c
+++ b/lib/whereami/whereami.c
@@ -13,8 +13,8 @@ extern "C" {
 #endif
 
 #if defined(__linux__) || defined(__CYGWIN__)
-#undef _BSD_SOURCE
-#define _BSD_SOURCE
+#undef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
 #elif defined(__APPLE__)
 #undef _DARWIN_C_SOURCE
 #define _DARWIN_C_SOURCE