diff --git a/src/pyFAI/opencl/azim_csr.py b/src/pyFAI/opencl/azim_csr.py
index 49f907adf..5ac301e9b 100644
--- a/src/pyFAI/opencl/azim_csr.py
+++ b/src/pyFAI/opencl/azim_csr.py
@@ -42,6 +42,7 @@
 else:
     raise ImportError("pyopencl is not installed")
 from ..containers import Integrate1dtpl, Integrate2dtpl, ErrorModel
+from ..utils import EPS32
 from . import processing, OpenclProcessing
 EventDescription = processing.EventDescription
 BufferDescription = processing.BufferDescription
@@ -1220,12 +1221,14 @@ def medfilt(self, data, dark=None, dummy=None, delta_dummy=None,
             events.append(EventDescription(kernel_correction_name, ev))
 
             kw_int["quant_min"] = numpy.float32(quant_min)
-            kw_int["quant_max"] = numpy.float32(quant_max)
+            kw_int["quant_max"] = numpy.float32(quant_max)*EPS32
 
             wg_min = max(self.workgroup_size["csr_medfilt"])
             kw_int["shared_int"] = pyopencl.LocalMemory(4 * wg_min)
             kw_int["shared_float"] = pyopencl.LocalMemory(8 * wg_min)
             wdim_bins = (wg_min, self.bins)
+
+
             integrate = self.kernels.csr_medfilt(self.queue, wdim_bins, (wg_min,1), *kw_int.values())
             events.append(EventDescription("medfilt", integrate))
 
diff --git a/src/pyFAI/opencl/test/test_ocl_azim_csr.py b/src/pyFAI/opencl/test/test_ocl_azim_csr.py
index 707416028..cdabfc58f 100644
--- a/src/pyFAI/opencl/test/test_ocl_azim_csr.py
+++ b/src/pyFAI/opencl/test/test_ocl_azim_csr.py
@@ -119,7 +119,7 @@ def integrate_ng(self, block_size=None, method_called="integrate_ng", extra=None
             elif method_called=="medfilt":
                 pix = csr[2][1:]-csr[2][:-1]
                 for i,j in zip(pix,res.count):
-                    print(j-i,i,j)
+                    print(i, j, i-j)
 
             # Intensities are not that different:
             delta = ref.intensity - res.intensity
@@ -159,7 +159,7 @@ def test_medfilt(self):
         """
         tests the median filtering kernel, default block size
         """
-        self.integrate_ng(None, "medfilt", {"quant_min":0, "quant_max":1})
+        self.integrate_ng(None, "medfilt", {"quant_min":0, "quant_max":1.0})
 
 
 def suite():
diff --git a/src/pyFAI/resources/openCL/medfilt.cl b/src/pyFAI/resources/openCL/medfilt.cl
index 00df7a673..11d29520e 100644
--- a/src/pyFAI/resources/openCL/medfilt.cl
+++ b/src/pyFAI/resources/openCL/medfilt.cl
@@ -202,6 +202,11 @@ csr_medfilt    (  const   global  float4  *data4,
             acc_var = dw_plus_fp(acc_var, w.s2);
             acc_nrm = dw_plus_fp(acc_nrm, w.s3);
             acc_nrm2 = dw_plus_dw(acc_nrm2, fp_times_fp(w.s3, w.s3));
+
+        }
+        else{
+            printf("bin:%d tid:%d qmin:%6.3f qlast:%6.3f qcur:%6.3f qmax:%6.3f\n",
+                    bin_num, tid, qmin, q_last, w.s0,qmax);
         }
     }
 //  Now parallel reductions, one after the other :-/