diff --git a/deps/cares/cares.gyp b/deps/cares/cares.gyp
index 8a5239b412..745e38e33d 100644
--- a/deps/cares/cares.gyp
+++ b/deps/cares/cares.gyp
@@ -12,6 +12,10 @@
       [ 'OS=="aix"', {
         'include_dirs': [ 'config/aix' ],
         'sources': [ 'config/aix/ares_config.h' ],
+        'defines': [
+          # Support for malloc(0)
+          '_LINUX_SOURCE_COMPAT=1',
+          '_ALL_SOURCE=1'],
       }],
       ['OS=="solaris"', {
         'defines': [