diff --git a/tests/shader_runner.c b/tests/shader_runner.c
index 29ac8749..8e6fdf9b 100644
--- a/tests/shader_runner.c
+++ b/tests/shader_runner.c
@@ -45,6 +45,8 @@
 #ifdef __MINGW32__
 # define _HRESULT_DEFINED
 typedef int HRESULT;
+#else
+# define WIDL_C_INLINE_WRAPPERS
 #endif
 
 #define COBJMACROS
diff --git a/tests/shader_runner_d3d12.c b/tests/shader_runner_d3d12.c
index 7729de7c..8119a66e 100644
--- a/tests/shader_runner_d3d12.c
+++ b/tests/shader_runner_d3d12.c
@@ -18,6 +18,9 @@
 
 #include "config.h"
 #include <assert.h>
+#ifndef __MINGW32__
+#define WIDL_C_INLINE_WRAPPERS
+#endif
 #define COBJMACROS
 #define CONST_VTABLE
 #define VKD3D_TEST_NO_DEFS
diff --git a/tests/shader_runner_gl.c b/tests/shader_runner_gl.c
index fdc418ba..632ba5cc 100644
--- a/tests/shader_runner_gl.c
+++ b/tests/shader_runner_gl.c
@@ -20,6 +20,9 @@
 
 #ifdef HAVE_OPENGL
 
+#ifndef __MINGW32__
+#define WIDL_C_INLINE_WRAPPERS
+#endif
 #define COBJMACROS
 #define VKD3D_TEST_NO_DEFS
 #define GL_GLEXT_PROTOTYPES