diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 4ed0806518f..a3ceea42912 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -1992,8 +1992,7 @@ bi_alu_src_index(bi_builder *b, nir_alu_src src, unsigned comps)
         } else if (bitsize == 8) {
                 /* 8-bit vectors not yet supported */
                 assert(comps == 1 && "8-bit vectors not supported");
-                assert(src.swizzle[0] < 4 && "8-bit vectors not supported");
-                idx.swizzle = BI_SWIZZLE_B0000 + src.swizzle[0];
+                idx.swizzle = BI_SWIZZLE_B0000 + (src.swizzle[0] & 3);
         }
 
         return idx;