diff --git a/c_src/eNifLock/rebar.config b/c_src/eNifLock/rebar.config
index d719afc..b21489b 100644
--- a/c_src/eNifLock/rebar.config
+++ b/c_src/eNifLock/rebar.config
@@ -3,8 +3,9 @@
 ]}.
 
 {port_env, [
-	{".*", "CXXFLAGS", "$CXXFLAGS -static -O3 -DNDEBUG -std=c++11"},
-	{".*", "LDFLAGS", "$LDFLAGS -static"}
+	{"(linux|solaris|freebsd|netbsd|openbsd|dragonfly|darwin|gnu)", "CXXFLAGS", "$CXXFLAGS -static -O3 -DNDEBUG $FLTO_FLAG -std=c++11"},
+	{"(linux|solaris|freebsd|netbsd|openbsd|dragonfly|darwin|gnu)", "LDFLAGS", "$LDFLAGS $FLTO_FLAG -static"},
+	{"win32", "CXXFLAGS", "$CXXFLAGS /O2 /DNDEBUG"}
 ]}.