diff --git a/src/libImaging/Chops.c b/src/libImaging/Chops.c
index 331f2dfe6..3ce8a0903 100644
--- a/src/libImaging/Chops.c
+++ b/src/libImaging/Chops.c
@@ -64,7 +64,8 @@ create(Imaging im1, Imaging im2, const ModeID mode) {
     int xsize, ysize;
 
     if (!im1 || !im2 || im1->type != IMAGING_TYPE_UINT8 ||
-        (mode != IMAGING_MODE_UNKNOWN && (im1->mode != mode || im2->mode != mode))) {
+        (mode != IMAGING_MODE_UNKNOWN &&
+         (im1->mode != IMAGING_MODE_1 || im2->mode != IMAGING_MODE_1))) {
         return (Imaging)ImagingError_ModeError();
     }
     if (im1->type != im2->type || im1->bands != im2->bands) {