diff --git a/brkraw/lib/loader.py b/brkraw/lib/loader.py
index 0a0fc99..b059888 100644
--- a/brkraw/lib/loader.py
+++ b/brkraw/lib/loader.py
@@ -820,13 +820,13 @@ def _get_bdata(method):
         # bmat = get_value(method, 'PVM_DwBMat')
         # return bval, bvec, bmat
         bval = get_value(method, 'PVM_DwBvalEach')
-        n_bval = len([bval]) if isinstance(bval, int) else len(bval)
+        bval = [bval] if isinstance(bval, int) else bval
         num_b0 = get_value(method, 'PVM_DwAoImages')
         num_exp = get_value(method, 'PVM_DwNDiffExp')
-        num_dir = int((num_exp - num_b0) / n_bval)
+        num_dir = int((num_exp - num_b0) / len(bval))
         bdir = get_value(method, 'PVM_DwDir')
         bvals = np.r_[np.zeros(num_b0), np.concatenate([bval for i in np.ones(num_dir).astype(int)], axis=0)]
-        bvecs = np.concatenate([np.zeros([num_b0, 3])] + [bdir] * n_bval, axis=0).T
+        bvecs = np.concatenate([np.zeros([num_b0, 3])] + [bdir] * len(bval), axis=0).T
         # test if results are correctly built
         try:
             assert(bvals.shape[0] == num_exp)