diff --git a/ChangeLog.txt b/ChangeLog.txt
index 2f8e751eb..87118b0f3 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -62,6 +62,7 @@
 - Changing settings for move and rotate tools through property browser does not take in count previous change for label point and Show label option.
 - Fix locking file after double save as.
 - Key --ignoremargins still required margins.
+- Fix inverse trigonometric functions. Wrong work with degrees.
 
 # Version 0.6.1 October 23, 2018
 - [#885] Regression. Broken support for multi size measurements.
diff --git a/src/libs/qmuparser/qmuparser.cpp b/src/libs/qmuparser/qmuparser.cpp
index a675e274e..40c23523c 100644
--- a/src/libs/qmuparser/qmuparser.cpp
+++ b/src/libs/qmuparser/qmuparser.cpp
@@ -184,7 +184,7 @@ qreal QmuParser::SinD(qreal v)
 //---------------------------------------------------------------------------------------------------------------------
 qreal QmuParser::ASinD(qreal v)
 {
-    return qRadiansToDegrees(qAsin(v));
+    return qAsin(qDegreesToRadians(v));
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -196,7 +196,7 @@ qreal QmuParser::CosD(qreal v)
 //---------------------------------------------------------------------------------------------------------------------
 qreal QmuParser::ACosD(qreal v)
 {
-    return qRadiansToDegrees(qAcos(v));
+    return qAcos(qDegreesToRadians(v));
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -208,7 +208,7 @@ qreal QmuParser::TanD(qreal v)
 //---------------------------------------------------------------------------------------------------------------------
 qreal QmuParser::ATanD(qreal v)
 {
-    return qRadiansToDegrees(qAtan(v));
+    return qAtan(qDegreesToRadians(v));
 }
 
 //---------------------------------------------------------------------------------------------------------------------