diff --git a/niftypet/nimpa/prc/prc.py b/niftypet/nimpa/prc/prc.py
index <HASH>..<HASH> 100644
--- a/niftypet/nimpa/prc/prc.py
+++ b/niftypet/nimpa/prc/prc.py
@@ -448,7 +448,7 @@ def pvc_iyang(
     #if affine transf. (faff) is given then take the T1 and resample it too.
     if isinstance(faff, basestring) and not os.path.isfile(faff):
         # faff is not given; get it by running the affine; get T1w to PET space
-        faff = reg_mr2pet(fpet, mridct, Cnt, outpath=outpath, fcomment=fcomment)
+        faff, _ = reg_mr2pet(fpet, mridct, Cnt, outpath=outpath, fcomment=fcomment)
 
     # establish the output folder
     if outpath=='':        
diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -182,7 +182,7 @@ elif platform.system() == 'Windows' :
 setup(
     name='nimpa',
     license = 'Apache 2.0',
-    version='1.0.14',
+    version='1.0.15',
     description='CUDA-accelerated Python utilities for high-throughput PET/MR image processing and analysis.',
     long_description=long_description,
     author='Pawel J. Markiewicz',
fixed bug with new registration in prc.py in nimpa