Minor change to explicit_operator aesthetics
diff --git a/src/hb.hh b/src/hb.hh
index 6df0a55..e4b9a81 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -137,14 +137,14 @@
/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
#ifndef explicit_operator
-#define explicit_operator
+#define explicit_operator operator
#endif
#else /* __cplusplus >= 201103L */
/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
#ifndef explicit_operator
-#define explicit_operator explicit
+#define explicit_operator explicit operator
#endif
#endif /* __cplusplus < 201103L */
