diff --git a/src/Parameter/parameterslider.cpp b/src/Parameter/parameterslider.cpp
index 50c09438..c0406466 100644
--- a/src/Parameter/parameterslider.cpp
+++ b/src/Parameter/parameterslider.cpp
@@ -26,8 +26,9 @@ void ParameterSlider::on_Changed(int)
 void ParameterSlider::setValue()
 {
     this->stackedWidget->setCurrentWidget(this->pageSlider);
-    this->slider->setMaximum(object->values->toRange().end_value());
+    this->slider->setRange(object->values->toRange().begin_value(),object->values->toRange().end_value());
     this->slider->setValue(object->value->toDouble());
-    this->slider->setMinimum(object->values->toRange().begin_value());
+    this->slider->setSingleStep(object->values->toRange().step_value());
+
     this->labelSliderValue->setText(QString::number(object->value->toDouble(), 'f', 0));
 }
diff --git a/src/comment_lexer.l b/src/comment_lexer.l
index 3b25a0e2..fc423b31 100644
--- a/src/comment_lexer.l
+++ b/src/comment_lexer.l
@@ -16,9 +16,9 @@ H [0-9a-fA-F]
 %%
 
 
-{D}+{E}? |
-{D}*\.{D}+{E}? |
-{D}+\.{D}*{E}? {
+[+-]?{D}+{E}? |
+[+-]?{D}*\.{D}+{E}? |
+[+-]?{D}+\.{D}*{E}? {
                     try {
                         yylval.num = boost::lexical_cast<double>(yytext);
                         return NUM;