diff --git a/client/whereami.c b/client/whereami.c
index 48e87c7fa..aa702adc2 100644
--- a/client/whereami.c
+++ b/client/whereami.c
@@ -10,6 +10,8 @@
 extern "C" {
 #endif
 
+#define _DEFAULT_SOURCE
+
 #if !defined(WAI_MALLOC) || !defined(WAI_FREE) || !defined(WAI_REALLOC)
 #include <stdlib.h>
 #endif
@@ -160,7 +162,6 @@ int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
 */
 
 #elif defined(__linux__)
-#define _DEFAULT_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>