diff --git a/dlls/d3dcompiler_43/bytecodewriter.c b/dlls/d3dcompiler_43/bytecodewriter.c
index 54321ed84d6..5a3e7f2333e 100644
--- a/dlls/d3dcompiler_43/bytecodewriter.c
+++ b/dlls/d3dcompiler_43/bytecodewriter.c
@@ -2543,22 +2543,8 @@ static HRESULT call_instr_handler(struct bc_writer *writer,
     return E_INVALIDARG;
 }
 
-/* SlWriteBytecode (wineshader.@)
- *
- * Writes shader version specific bytecode from the shader passed in.
- * The returned bytecode can be passed to the Direct3D runtime like
- * IDirect3DDevice9::Create*Shader.
- *
- * Parameters:
- *  shader: Shader to translate into bytecode
- *  version: Shader version to generate(d3d version token)
- *  dxversion: DirectX version the code targets
- *  result: the resulting shader bytecode
- *
- * Return values:
- *  S_OK on success
- */
-DWORD SlWriteBytecode(const struct bwriter_shader *shader, int dxversion, DWORD **result) {
+HRESULT SlWriteBytecode(const struct bwriter_shader *shader, int dxversion, DWORD **result, DWORD *size)
+{
     struct bc_writer *writer;
     struct bytecode_buffer *buffer = NULL;
     HRESULT hr;
@@ -2610,12 +2596,8 @@ DWORD SlWriteBytecode(const struct bwriter_shader *shader, int dxversion, DWORD
         goto error;
     }
 
-    /* Cut off unneeded memory from the result buffer */
-    *result = d3dcompiler_realloc(buffer->data,
-                         sizeof(DWORD) * buffer->size);
-    if(!*result) {
-        *result = buffer->data;
-    }
+    *size = buffer->size * sizeof(DWORD);
+    *result = buffer->data;
     buffer->data = NULL;
     hr = S_OK;
 
diff --git a/dlls/d3dcompiler_43/compiler.c b/dlls/d3dcompiler_43/compiler.c
index 7f4ebdba42a..e273d6b265f 100644
--- a/dlls/d3dcompiler_43/compiler.c
+++ b/dlls/d3dcompiler_43/compiler.c
@@ -396,9 +396,8 @@ static HRESULT assemble_shader(const char *preproc_shader,
     struct bwriter_shader *shader;
     char *messages = NULL;
     HRESULT hr;
-    DWORD *res;
-    LPD3DBLOB buffer;
-    int size;
+    DWORD *res, size;
+    ID3DBlob *buffer;
     char *pos;
 
     shader = SlAssembleShader(preproc_shader, &messages);
@@ -443,7 +442,7 @@ static HRESULT assemble_shader(const char *preproc_shader,
         return D3DXERR_INVALIDDATA;
     }
 
-    hr = SlWriteBytecode(shader, 9, &res);
+    hr = SlWriteBytecode(shader, 9, &res, &size);
     SlDeleteShader(shader);
     if (FAILED(hr))
     {
@@ -453,7 +452,6 @@ static HRESULT assemble_shader(const char *preproc_shader,
 
     if (shader_blob)
     {
-        size = HeapSize(GetProcessHeap(), 0, res);
         hr = D3DCreateBlob(size, &buffer);
         if (FAILED(hr))
         {
diff --git a/dlls/d3dcompiler_43/d3dcompiler_private.h b/dlls/d3dcompiler_43/d3dcompiler_private.h
index d7190216f43..e64f4cfb59b 100644
--- a/dlls/d3dcompiler_43/d3dcompiler_private.h
+++ b/dlls/d3dcompiler_43/d3dcompiler_private.h
@@ -570,7 +570,7 @@ typedef enum _BWRITERDECLUSAGE {
 #define T3_REG          5
 
 struct bwriter_shader *SlAssembleShader(const char *text, char **messages) DECLSPEC_HIDDEN;
-DWORD SlWriteBytecode(const struct bwriter_shader *shader, int dxversion, DWORD **result) DECLSPEC_HIDDEN;
+HRESULT SlWriteBytecode(const struct bwriter_shader *shader, int dxversion, DWORD **result, DWORD *size) DECLSPEC_HIDDEN;
 void SlDeleteShader(struct bwriter_shader *shader) DECLSPEC_HIDDEN;
 
 #define MAKE_TAG(ch0, ch1, ch2, ch3) \