diff --git a/src/tdepowersave.cpp b/src/tdepowersave.cpp
index 4db6039..2cbc837 100644
--- a/src/tdepowersave.cpp
+++ b/src/tdepowersave.cpp
@@ -2938,7 +2938,7 @@ int tdepowersave::brightnessGet() {
 	int retval = -1;
 
 	if (hwinfo->supportBrightness()) {
-		retval = (int)(((float)hwinfo->getCurrentBrightnessLevel() / (float)hwinfo->getMaxBrightnessLevel()-1) * 100.0);
+		retval = (int)(100.0 * hwinfo->getCurrentBrightnessLevel() / hwinfo->getMaxBrightnessLevel());
 	}
 
 	kdDebugFuncOut(trace);