1 files changed, 3 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index a408d24ff9..1ef03cff15 100644
--- a/setup.py
+++ b/setup.py
@@ -148,11 +148,13 @@ if "win32" in sys.platform:
 
 DEFINE_MACROS = (
     ('OPENSSL_NO_ASM', 1), ('_WIN32_WINNT', 0x600),
-    ('GPR_BACKWARDS_COMPATIBILITY_MODE', 1), ('HAVE_CONFIG_H', 1),)
+    ('GPR_BACKWARDS_COMPATIBILITY_MODE', 1),)
 if "win32" in sys.platform:
   DEFINE_MACROS += (('OPENSSL_WINDOWS', 1), ('WIN32_LEAN_AND_MEAN', 1),)
   if '64bit' in platform.architecture()[0]:
     DEFINE_MACROS += (('MS_WIN64', 1),)
+else:
+  DEFINE_MACROS += (('HAVE_CONFIG_H', 1),)
 
 LDFLAGS = tuple(EXTRA_LINK_ARGS)
 CFLAGS = tuple(EXTRA_COMPILE_ARGS)