diff --git a/src/mesa/main/externalobjects.c b/src/mesa/main/externalobjects.c
index d406baad1c4..f865471cafb 100644
--- a/src/mesa/main/externalobjects.c
+++ b/src/mesa/main/externalobjects.c
@@ -1080,7 +1080,7 @@ _mesa_ImportMemoryWin32HandleEXT(GLuint memory,
 
    const char *func = "glImportMemoryWin32HandleEXT";
 
-   if (!ctx->Extensions.EXT_memory_object_win32) {
+   if (!_mesa_has_EXT_memory_object_win32(ctx)) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(unsupported)", func);
       return;
    }
@@ -1111,7 +1111,7 @@ _mesa_ImportMemoryWin32NameEXT(GLuint memory,
 
    const char *func = "glImportMemoryWin32NameEXT";
 
-   if (!ctx->Extensions.EXT_memory_object_win32) {
+   if (!_mesa_has_EXT_memory_object_win32(ctx)) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(unsupported)", func);
       return;
    }
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 451a5e8da34..689cb1bebd8 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -2929,7 +2929,7 @@ find_value_indexed(const char *func, GLenum pname, GLuint index, union value *v)
       return TYPE_INT_4;
    /* GL_EXT_memory_object_win32 */
    case GL_DEVICE_LUID_EXT:
-      if (!ctx->Extensions.EXT_memory_object_win32 && !ctx->Extensions.EXT_semaphore_win32)
+      if (!_mesa_has_EXT_memory_object_win32(ctx) && !ctx->Extensions.EXT_semaphore_win32)
          goto invalid_enum;
       if (index >= 1)
          goto invalid_value;