diff --git a/rtengine/ipsharpen.cc b/rtengine/ipsharpen.cc
index a84132a4c..321dd635f 100644
--- a/rtengine/ipsharpen.cc
+++ b/rtengine/ipsharpen.cc
@@ -177,7 +177,7 @@ BENCHFUN
     // calculate contrast based blend factors to reduce sharpening in regions with low contrast
     JaggedArray<float> blend(W, H);
     float contrast = sharpenParam.contrast / 100.f;
-    buildBlendMask(luminance, blend, W, H, contrast, sharpenParam.deconvamount / 100.0);
+    buildBlendMask(luminance, blend, W, H, contrast, sharpenParam.deconvamount / 100.f);
 
     const float damping = sharpenParam.deconvdamping / 5.0;
     const bool needdamp = sharpenParam.deconvdamping > 0;
@@ -224,7 +224,7 @@ void ImProcFunctions::sharpening (LabImage* lab, const SharpeningParams &sharpen
         // calculate contrast based blend factors to reduce sharpening in regions with low contrast
         JaggedArray<float> blend(W, H);
         float contrast = sharpenParam.contrast / 100.f;
-        buildBlendMask(lab->L, blend, W, H, contrast, sharpenParam.method == "rld" ? sharpenParam.deconvamount / 100.0 : 1.f);
+        buildBlendMask(lab->L, blend, W, H, contrast, sharpenParam.method == "rld" ? sharpenParam.deconvamount / 100.f : 1.f);
 #ifdef _OPENMP
         #pragma omp parallel for
 #endif