diff --git a/src/modules/RFM2x/RFM22.h b/src/modules/RFM2x/RFM22.h
index 3204c7ca..61387b17 100644
--- a/src/modules/RFM2x/RFM22.h
+++ b/src/modules/RFM2x/RFM22.h
@@ -14,7 +14,7 @@
 
   \brief Only exists as alias for Si4432, since there seems to be no difference between %RFM22 and %Si4432 modules.
 */
-using RFM22 = Si4432;
+RADIOLIB_TYPE_ALIAS(Si4432, RFM22);
 
 #endif
 
diff --git a/src/modules/RFM2x/RFM23.h b/src/modules/RFM2x/RFM23.h
index 45a708a2..02afc68a 100644
--- a/src/modules/RFM2x/RFM23.h
+++ b/src/modules/RFM2x/RFM23.h
@@ -14,7 +14,7 @@
 
   \brief Only exists as alias for Si4431, since there seems to be no difference between %RFM23 and %Si4431 modules.
 */
-using RFM23 = Si4431;
+RADIOLIB_TYPE_ALIAS(Si4431, RFM23);
 
 #endif