diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
index b1168b941b9..5b4ccc60e72 100644
--- a/src/amd/vulkan/radv_nir_to_llvm.c
+++ b/src/amd/vulkan/radv_nir_to_llvm.c
@@ -190,7 +190,7 @@ get_tcs_num_patches(struct radv_shader_context *ctx)
 
 	/* GFX6 bug workaround - limit LS-HS threadgroups to only one wave. */
 	if (ctx->options->chip_class == GFX6) {
-		unsigned one_wave = ctx->options->wave_size / MAX2(num_tcs_input_cp, num_tcs_output_cp);
+		unsigned one_wave = 64 / MAX2(num_tcs_input_cp, num_tcs_output_cp);
 		num_patches = MIN2(num_patches, one_wave);
 	}
 	return num_patches;