diff --git a/sys/d3d11/gstd3d11pluginutils.cpp b/sys/d3d11/gstd3d11pluginutils.cpp
index c96479b1d5..5d899c765f 100644
--- a/sys/d3d11/gstd3d11pluginutils.cpp
+++ b/sys/d3d11/gstd3d11pluginutils.cpp
@@ -888,7 +888,7 @@ error:
   {
     guint i;
     for (i = 0; i < num_mapped; i++) {
-      GstMemory *mem = gst_buffer_peek_memory (buffer, num_mapped);
+      GstMemory *mem = gst_buffer_peek_memory (buffer, i);
       gst_memory_unmap (mem, &info[i]);
     }