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-rw-r--r--include/android-ashmem.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/android-ashmem.h b/include/android-ashmem.h
index 1bfd3220..065c213b 100644
--- a/include/android-ashmem.h
+++ b/include/android-ashmem.h
@@ -2,7 +2,9 @@
   #ifndef _ANDROID_ASHMEM_H
     #define _ANDROID_ASHMEM_H
 
-    #define _GNU_SOURCE
+    #ifndef _GNU_SOURCE
+      #define _GNU_SOURCE
+    #endif
     #include <sys/syscall.h>
     #include <unistd.h>
     #include <fcntl.h>