diff --git a/wled00/cfg.cpp b/wled00/cfg.cpp
index de00d4ec..f2726303 100644
--- a/wled00/cfg.cpp
+++ b/wled00/cfg.cpp
@@ -807,8 +807,8 @@ void serializeConfig() {
   light[F("aseg")] = autoSegments;
 
   JsonObject light_gc = light.createNestedObject("gc");
-  light_gc["bri"] = (gammaCorrectBri) ? gammaCorrectVal : 1.0;  // keep compatibility
-  light_gc["col"] = (gammaCorrectCol) ? gammaCorrectVal : 1.0;  // keep compatibility
+  light_gc["bri"] = (gammaCorrectBri) ? gammaCorrectVal : 1.0f;  // keep compatibility
+  light_gc["col"] = (gammaCorrectCol) ? gammaCorrectVal : 1.0f;  // keep compatibility
   light_gc["val"] = gammaCorrectVal;
 
   JsonObject light_tr = light.createNestedObject("tr");
diff --git a/wled00/xml.cpp b/wled00/xml.cpp
index 6ab0cecf..95498db0 100644
--- a/wled00/xml.cpp
+++ b/wled00/xml.cpp
@@ -445,7 +445,7 @@ void getSettingsJS(byte subPage, char* dest)
 
     sappend('c',SET_F("GB"),gammaCorrectBri);
     sappend('c',SET_F("GC"),gammaCorrectCol);
-    sprintf_P(nS, PSTR("d.Sf.GV.value='%.1f';"), (float)gammaCorrectVal); oappend(nS);
+    dtostrf(gammaCorrectVal,3,1,nS); sappends('s',SET_F("GV"),nS);
     sappend('c',SET_F("TF"),fadeTransition);
     sappend('v',SET_F("TD"),transitionDelayDefault);
     sappend('c',SET_F("PF"),strip.paletteFade);