Index: src/OFMethodSignature.m
==================================================================
--- src/OFMethodSignature.m
+++ src/OFMethodSignature.m
@@ -193,11 +193,11 @@
 		size = sizeof(long long);
 		break;
 #ifdef __SIZEOF_INT128__
 	case 't':
 	case 'T':
-		size = sizeof(__int128);
+		size = __extension__ sizeof(__int128);
 		break;
 #endif
 	case 'f':
 		size = sizeof(float);
 		break;
@@ -412,11 +412,11 @@
 		align = OF_ALIGNOF(long long);
 		break;
 #ifdef __SIZEOF_INT128__
 	case 't':
 	case 'T':
-		align = OF_ALIGNOF(__int128);
+		align = __extension__ OF_ALIGNOF(__int128);
 		break;
 #endif
 	case 'f':
 		align = OF_ALIGNOF(float);
 		break;