diff --git a/src/glsl/spirv_shaderc.c b/src/glsl/spirv_shaderc.c
index 3afd750..8c3d5e0 100644
--- a/src/glsl/spirv_shaderc.c
+++ b/src/glsl/spirv_shaderc.c
@@ -112,7 +112,7 @@ static pl_str shaderc_compile(pl_spirv spirv, void *alloc,
         return (pl_str) {0};
 
     shaderc_compile_options_set_optimization_level(opts,
-            shaderc_optimization_level_performance);
+            shaderc_optimization_level_size);
     shaderc_compile_options_set_target_spirv(opts, spirv->version.spv_version);
     shaderc_compile_options_set_target_env(opts, shaderc_target_env_vulkan,
                                                  spirv->version.env_version);