diff --git a/dynasm/dasm_arm64.h b/dynasm/dasm_arm64.h
index 47e1e074..ff21236d 100644
--- a/dynasm/dasm_arm64.h
+++ b/dynasm/dasm_arm64.h
@@ -427,6 +427,7 @@ int dasm_encode(Dst_DECL, void *buffer)
 	  break;
 	case DASM_REL_LG:
 	  CK(n >= 0, UNDEF_LG);
+	  /* fallthrough */
 	case DASM_REL_PC:
 	  CK(n >= 0, UNDEF_PC);
 	  n = *DASM_POS2PTR(D, n) - (int)((char *)cp - base) + 4;