diff --git a/src/common/PaletteHandler.hxx b/src/common/PaletteHandler.hxx
index 3de835d7d..ed46da516 100644
--- a/src/common/PaletteHandler.hxx
+++ b/src/common/PaletteHandler.hxx
@@ -126,7 +126,7 @@ class PaletteHandler
       Convert adjustables from/to 100% scale
     */
     static constexpr float scaleFrom100(float x) { return (x / 50.F) - 1.F; }
-    static constexpr uInt32 scaleTo100(float x)  { return uInt32(50 * (x + 1.F)); }
+    static constexpr uInt32 scaleTo100(float x)  { return uInt32(50.0001F * (x + 1.F)); }
 
     /**
       Convert palette settings name to enumeration.
diff --git a/src/common/tv_filters/NTSCFilter.cxx b/src/common/tv_filters/NTSCFilter.cxx
index 9764f1ac3..8e7e899c9 100644
--- a/src/common/tv_filters/NTSCFilter.cxx
+++ b/src/common/tv_filters/NTSCFilter.cxx
@@ -20,8 +20,8 @@
 
 #include "NTSCFilter.hxx"
 
-constexpr float scaleFrom100(float x) { return (x/50.F) - 1.F;     }
-constexpr uInt32 scaleTo100(float x)  { return uInt32(50*(x+1.F)); }
+constexpr float scaleFrom100(float x) { return (x / 50.F) - 1.F;     }
+constexpr uInt32 scaleTo100(float x)  { return uInt32(50.0001F * (x + 1.F)); }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 string NTSCFilter::setPreset(Preset preset)