diff --git a/gst-libs/gst/gl/gstglbasememory.c b/gst-libs/gst/gl/gstglbasememory.c
index 915e19e3b5..2d4c8c3147 100644
--- a/gst-libs/gst/gl/gstglbasememory.c
+++ b/gst-libs/gst/gl/gstglbasememory.c
@@ -732,6 +732,8 @@ gst_gl_base_memory_alloc (GstGLBaseMemoryAllocator * allocator,
 {
   GstGLBaseMemoryAllocatorClass *alloc_class;
 
+  g_return_val_if_fail (GST_IS_GL_BASE_MEMORY_ALLOCATOR (allocator), NULL);
+
   alloc_class = GST_GL_BASE_MEMORY_ALLOCATOR_GET_CLASS (allocator);
 
   g_return_val_if_fail (alloc_class != NULL, NULL);
diff --git a/gst-libs/gst/gl/gstglbasememory.h b/gst-libs/gst/gl/gstglbasememory.h
index 642684a542..bee28444ee 100644
--- a/gst-libs/gst/gl/gstglbasememory.h
+++ b/gst-libs/gst/gl/gstglbasememory.h
@@ -32,7 +32,7 @@ G_BEGIN_DECLS
 #define GST_TYPE_GL_BASE_MEMORY_ALLOCATOR (gst_gl_base_memory_allocator_get_type())
 GType gst_gl_base_memory_allocator_get_type(void);
 
-#define GST_IS_GL_BASE_MEMORY_ALLOCATOR(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GL_ALLOCATOR))
+#define GST_IS_GL_BASE_MEMORY_ALLOCATOR(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GL_BASE_MEMORY_ALLOCATOR))
 #define GST_IS_GL_BASE_MEMORY_ALLOCATOR_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GL_BASE_MEMORY_ALLOCATOR))
 #define GST_GL_BASE_MEMORY_ALLOCATOR_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_GL_BASE_MEMORY_ALLOCATOR, GstGLBaseMemoryAllocatorClass))
 #define GST_GL_BASE_MEMORY_ALLOCATOR(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GL_BASE_MEMORY_ALLOCATOR, GstGLBaseMemoryAllocator))