diff --git a/docs/examples/Makefile.m32 b/docs/examples/Makefile.m32
index 71369487a7..15eaf82b3a 100644
--- a/docs/examples/Makefile.m32
+++ b/docs/examples/Makefile.m32
@@ -356,7 +356,7 @@ ifdef SSPI
   CFLAGS += -DUSE_WINDOWS_SSPI
 endif
 ifdef IPV6
-  CFLAGS += -DENABLE_IPV6 -D_WIN32_WINNT=0x0501
+  CFLAGS += -DENABLE_IPV6
 endif
 ifdef LDAPS
   CFLAGS += -DHAVE_LDAP_SSL
diff --git a/lib/Makefile.m32 b/lib/Makefile.m32
index 227e4e95c9..1987b237e5 100644
--- a/lib/Makefile.m32
+++ b/lib/Makefile.m32
@@ -380,7 +380,7 @@ ifdef SPNEGO
   CFLAGS += -DHAVE_SPNEGO
 endif
 ifdef IPV6
-  CFLAGS += -DENABLE_IPV6 -D_WIN32_WINNT=0x0501
+  CFLAGS += -DENABLE_IPV6
 endif
 ifdef LDAPS
   CFLAGS += -DHAVE_LDAP_SSL
diff --git a/src/Makefile.m32 b/src/Makefile.m32
index a5ae2bec90..b3d3cf9631 100644
--- a/src/Makefile.m32
+++ b/src/Makefile.m32
@@ -381,7 +381,7 @@ ifdef SSPI
   CFLAGS += -DUSE_WINDOWS_SSPI
 endif
 ifdef IPV6
-  CFLAGS += -DENABLE_IPV6 -D_WIN32_WINNT=0x0501
+  CFLAGS += -DENABLE_IPV6
 endif
 ifdef LDAPS
   CFLAGS += -DHAVE_LDAP_SSL