diff --git a/include/d3d12.idl b/include/d3d12.idl
index ffc08c0a..8651096a 100644
--- a/include/d3d12.idl
+++ b/include/d3d12.idl
@@ -549,7 +549,7 @@ typedef enum D3D12_ROOT_SIGNATURE_FLAGS
     D3D12_ROOT_SIGNATURE_FLAG_DENY_VERTEX_SHADER_ROOT_ACCESS = 0x02,
     D3D12_ROOT_SIGNATURE_FLAG_DENY_HULL_SHADER_ROOT_ACCESS = 0x04,
     D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS = 0x08,
-    D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACESS = 0x10,
+    D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS = 0x10,
     D3D12_ROOT_SIGNATURE_FLAG_DENY_PIXEL_SHADER_ROOT_ACCESS = 0x20,
     D3D12_ROOT_SIGNATURE_FLAG_ALLOW_STREAM_OUTPUT = 0x40,
 } D3D12_ROOT_SIGNATURE_FLAGS;
@@ -1386,8 +1386,8 @@ typedef struct D3D12_DISCARD_REGION
 
 typedef enum D3D12_QUERY_TYPE
 {
-    D3D12_QUERY_TYPE_OCCLUSSION = 0,
-    D3D12_QUERY_TYPE_BINARY_OCCLUSSION = 1,
+    D3D12_QUERY_TYPE_OCCLUSION = 0,
+    D3D12_QUERY_TYPE_BINARY_OCCLUSION = 1,
     D3D12_QUERY_TYPE_TIMESTAMP = 2,
     D3D12_QUERY_TYPE_PIPELINE_STATISTICS = 3,
     D3D12_QUERY_TYPE_SO_STATISTICS_STREAM0 = 4,