diff --git a/src/compiler/nir/nir_lower_blend.c b/src/compiler/nir/nir_lower_blend.c
index f9878cad0db..d17d6768435 100644
--- a/src/compiler/nir/nir_lower_blend.c
+++ b/src/compiler/nir/nir_lower_blend.c
@@ -313,6 +313,8 @@ nir_blend_logicop(
    if (util_format_is_unorm(format)) {
       out = nir_format_unorm_to_float(b, out, bits);
    } else if (util_format_is_snorm(format)) {
+      /* Sign extend before converting so the i2f in snorm_to_float works */
+      out = nir_format_sign_extend_ivec(b, out, bits);
       out = nir_format_snorm_to_float(b, out, bits);
    } else {
       assert(util_format_is_pure_integer(format));