diff --git a/projects/apis/metal/src/instance/metal_instance.m b/projects/apis/metal/src/instance/metal_instance.m
index 4cdaf31..1ad172e 100644
--- a/projects/apis/metal/src/instance/metal_instance.m
+++ b/projects/apis/metal/src/instance/metal_instance.m
@@ -9,7 +9,7 @@ gnReturnCode metalCreateInstance(gnInstanceHandle instance, gnInstanceCreateInfo
     return GN_SUCCESS;
 }
 gnReturnCode metalQueryDevices(gnInstanceHandle instance, uint32_t* count, gnPhysicalDeviceHandle* devices, gryphnInstanceFunctionLayers* next) {
-    if (instance == GN_NULL_HANDLE) return NULL;
+    if (instance == GN_NULL_HANDLE) return GN_INVALID_HANDLE;
     NSArray *metalDevices = MTLCopyAllDevices();
     *count = (uint32_t)[metalDevices count];
     if (devices == NULL) return GN_SUCCESS;
diff --git a/projects/apis/metal/src/texture/metal_texture.h b/projects/apis/metal/src/texture/metal_texture.h
index 891d36d..5dcf103 100644
--- a/projects/apis/metal/src/texture/metal_texture.h
+++ b/projects/apis/metal/src/texture/metal_texture.h
@@ -13,4 +13,4 @@ void metalTextureData(gnTextureHandle texture, void* pixelData);
 void metalDestroyTexture(gnTexture texture);
 
 
-NSUInteger mtlSampleCount(gnMultisampleCountFlags flags);
+NSUInteger mtlSampleCount(gnSampleCountFlags flags);
diff --git a/projects/apis/metal/src/texture/metal_texture.m b/projects/apis/metal/src/texture/metal_texture.m
index 1c53b98..7272d8c 100644
--- a/projects/apis/metal/src/texture/metal_texture.m
+++ b/projects/apis/metal/src/texture/metal_texture.m
@@ -2,7 +2,7 @@
 #include "surface/metal_surface.h"
 #include "devices/metal_output_devices.h"
 
-NSUInteger mtlSampleCount(gnMultisampleCountFlags flags) {
+NSUInteger mtlSampleCount(gnSampleCountFlags flags) {
     if ((flags & GN_SAMPLE_BIT_64) == GN_SAMPLE_BIT_64) { return 64; }
     if ((flags & GN_SAMPLE_BIT_32) == GN_SAMPLE_BIT_32) { return 32; }
     if ((flags & GN_SAMPLE_BIT_16) == GN_SAMPLE_BIT_16) { return 16; }