diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6159df7..d16f16d4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 1.7.1 (January 19, 2024)
+- BUGFIX: correct bug in the "chunking" of TOF sinogram projections in the python interface
+
 ## 1.7.0 (January 15, 2024)
 - update of documentation
 - addition of more examples
diff --git a/package.json b/package.json
index 6076f7d2..96bed229 100644
--- a/package.json
+++ b/package.json
@@ -1,3 +1,3 @@
 {
-  "version": "1.7.0"
+  "version": "1.7.1"
 }
diff --git a/python/parallelproj/backend.py b/python/parallelproj/backend.py
index 5a6d3949..a37aa447 100644
--- a/python/parallelproj/backend.py
+++ b/python/parallelproj/backend.py
@@ -768,7 +768,7 @@ def joseph3d_fwd_tof_sino(
                     d_img,
                     np.asarray(img_origin, dtype=np.float32),
                     np.asarray(voxsize, dtype=np.float32),
-                    img_fwd.ravel()[ic[i] : (ic[i + 1])],
+                    img_fwd.ravel()[ntofbins*ic[i] : ntofbins*(ic[i + 1])],
                     ic[i + 1] - ic[i],
                     np.asarray(img.shape, dtype=np.int32),
                     np.float32(tofbin_width),
@@ -935,7 +935,7 @@ def joseph3d_back_tof_sino(
                     d_back_img,
                     np.asarray(img_origin, dtype=np.float32),
                     np.asarray(voxsize, dtype=np.float32),
-                    np.asarray(img_fwd, dtype=np.float32).ravel()[ic[i] : ic[i + 1]],
+                    np.asarray(img_fwd, dtype=np.float32).ravel()[ntofbins*ic[i] : ntofbins*ic[i + 1]],
                     ic[i + 1] - ic[i],
                     np.asarray(back_img.shape, dtype=np.int32),
                     np.float32(tofbin_width),
diff --git a/test/parallelproj/test_nontof_joseph.py b/test/parallelproj/test_nontof_joseph.py
index 314aa0d0..a2d8e54b 100644
--- a/test/parallelproj/test_nontof_joseph.py
+++ b/test/parallelproj/test_nontof_joseph.py
@@ -64,7 +64,7 @@ def test_fwd(
     xstart = vstart * voxel_size + img_origin
     xend = vend * voxel_size + img_origin
 
-    img_fwd = parallelproj.joseph3d_fwd(xstart, xend, img, img_origin, voxel_size)
+    img_fwd = parallelproj.joseph3d_fwd(xstart, xend, img, img_origin, voxel_size, num_chunks=3)
 
     # setup the expected values for the projection
     expected_projections = xp.zeros_like(img_fwd, device=dev)
@@ -153,12 +153,12 @@ def test_adjointness(
     xend[:, 2] = R * costheta
 
     # forward project
-    img_fwd = parallelproj.joseph3d_fwd(xstart, xend, img, img_origin, voxel_size)
+    img_fwd = parallelproj.joseph3d_fwd(xstart, xend, img, img_origin, voxel_size, num_chunks=3)
 
     # backward project
     sino = xp.asarray(np.random.rand(*img_fwd.shape), dtype=xp.float32, device=dev)
     back_img = parallelproj.joseph3d_back(
-        xstart, xend, img.shape, img_origin, voxel_size, sino
+        xstart, xend, img.shape, img_origin, voxel_size, sino, num_chunks=5
     )
 
     ip_a = float(xp.sum((back_img * img)))
diff --git a/test/parallelproj/test_toflm_joseph.py b/test/parallelproj/test_toflm_joseph.py
index 3d5591e4..af12de16 100644
--- a/test/parallelproj/test_toflm_joseph.py
+++ b/test/parallelproj/test_toflm_joseph.py
@@ -70,6 +70,7 @@ def test_tof_lm_fwd(
         tofcenter_offset,
         nsigmas,
         tof_bin,
+        num_chunks=3
     )
 
     # check if sum of the projection is correct (should be equal to the voxel
@@ -237,6 +238,7 @@ def test_adjointness(
         tofcenter_offset,
         nsigmas,
         tof_bin,
+        num_chunks=7
     )
 
     # backward project
@@ -254,6 +256,7 @@ def test_adjointness(
         tofcenter_offset,
         nsigmas,
         tof_bin,
+        num_chunks=11
     )
 
     ip_a = float(xp.sum(back_img * img))
diff --git a/test/parallelproj/test_tofsino_joseph.py b/test/parallelproj/test_tofsino_joseph.py
index fd6e639d..0d2a93c6 100644
--- a/test/parallelproj/test_tofsino_joseph.py
+++ b/test/parallelproj/test_tofsino_joseph.py
@@ -63,6 +63,7 @@ def test_tof_sino_fwd(
         tofcenter_offset,
         nsigmas,
         num_tof_bins,
+        num_chunks=3,
     )
 
     # check if sum of the projection is correct (should be equal to the voxel
@@ -196,6 +197,7 @@ def test_adjointness(
         tofcenter_offset,
         nsigmas,
         num_tof_bins,
+        num_chunks=3,
     )
 
     # backward project
@@ -212,6 +214,7 @@ def test_adjointness(
         tofcenter_offset,
         nsigmas,
         num_tof_bins,
+        num_chunks=5,
     )
 
     ip_a = float(xp.sum((back_img * img)))