diff --git a/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_bimg.go b/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_bimg.go
index 2880c47d2..5ba3994e1 100644
--- a/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_bimg.go
+++ b/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_bimg.go
@@ -151,8 +151,8 @@ func createThumbnail(src types.Path, buffer []byte, config types.ThumbnailSize,
 			FileSizeBytes: types.FileSizeBytes(stat.Size()),
 		},
 		ThumbnailSize: types.ThumbnailSize{
-			Width:        width,
-			Height:       height,
+			Width:        config.Width,
+			Height:       config.Height,
 			ResizeMethod: config.ResizeMethod,
 		},
 	}
diff --git a/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_nfnt.go b/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_nfnt.go
index c342bb982..4517cda41 100644
--- a/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_nfnt.go
+++ b/src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_nfnt.go
@@ -185,8 +185,8 @@ func createThumbnail(src types.Path, img image.Image, config types.ThumbnailSize
 			FileSizeBytes: types.FileSizeBytes(stat.Size()),
 		},
 		ThumbnailSize: types.ThumbnailSize{
-			Width:        width,
-			Height:       height,
+			Width:        config.Width,
+			Height:       config.Height,
 			ResizeMethod: config.ResizeMethod,
 		},
 	}