diff --git a/include/gx2r/surface.h b/include/gx2r/surface.h
index a4753e7..1a43573 100644
--- a/include/gx2r/surface.h
+++ b/include/gx2r/surface.h
@@ -28,9 +28,6 @@ void
 GX2RDestroySurfaceEx(GX2Surface *surface,
                      GX2RResourceFlags flags);
 
-BOOL
-GX2RIsGX2RSurface(GX2RResourceFlags flags);
-
 void
 GX2RInvalidateSurface(GX2Surface *surface,
                       int32_t level,
diff --git a/rpl/libgx2/exports.h b/rpl/libgx2/exports.h
index 28ff482..da0a331 100644
--- a/rpl/libgx2/exports.h
+++ b/rpl/libgx2/exports.h
@@ -233,7 +233,6 @@ EXPORT(GX2RSetAllocator);
 EXPORT(GX2RCreateSurface);
 EXPORT(GX2RCreateSurfaceUserMemory);
 EXPORT(GX2RDestroySurfaceEx);
-EXPORT(GX2RIsGX2RSurface);
 EXPORT(GX2RInvalidateSurface);
 EXPORT(GX2RLockSurfaceEx);
 EXPORT(GX2RUnlockSurfaceEx);