1 files changed, 4 insertions, 0 deletions
diff --git a/src/Blocks/BlockSideways.h b/src/Blocks/BlockSideways.h
index 74b05e33c..e52fbaa2f 100644
--- a/src/Blocks/BlockSideways.h
+++ b/src/Blocks/BlockSideways.h
@@ -64,6 +64,10 @@ public:
 				return a_Meta | 0xC;  // No idea, give a special meta
 			}
 		}
+		#if !defined(__clang__)
+			ASSERT(!"Unknown BLOCK_FACE");
+			return 0;
+		#endif
 	}
 } ;