diff --git a/ChangeLog.txt b/ChangeLog.txt
index 2f54e9e4d..e6c37c571 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -45,6 +45,7 @@
 - [#807] Issue with "Intersection" passmark.
 - [#667] Check for updates - Test version.
 - [#808] New feature. Global line width option.
+- [#814] Make "\" valid character.
 
 # Version 0.5.1
 - [#683] Tool Seam allowance's dialog is off screen on small resolutions.
diff --git a/src/libs/ifc/schema/pattern/v0.7.6.xsd b/src/libs/ifc/schema/pattern/v0.7.6.xsd
index 3c80a2129..df1df950e 100644
--- a/src/libs/ifc/schema/pattern/v0.7.6.xsd
+++ b/src/libs/ifc/schema/pattern/v0.7.6.xsd
@@ -751,7 +751,7 @@
   </xs:element>
   <xs:simpleType name="shortName">
     <xs:restriction base="xs:string">
-      <xs:pattern value="([^\p{Nd}\p{Zs}*/&amp;|!&lt;&gt;^\()\-−+.,٫, ٬.’=?:;'\\&quot;]){1,1}([^\p{Zs}*/&amp;|!&lt;&gt;^\()\-−+.,٫, ٬.’=?:;\\&quot;]){0,}"/>
+      <xs:pattern value="([^\p{Nd}\p{Zs}*/&amp;|!&lt;&gt;^\()\-−+.,٫, ٬.’=?:;'\&quot;]){1,1}([^\p{Zs}*/&amp;|!&lt;&gt;^\()\-−+.,٫, ٬.’=?:;\&quot;]){0,}"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="units">
diff --git a/src/libs/qmuparser/qmuformulabase.cpp b/src/libs/qmuparser/qmuformulabase.cpp
index 94c62043d..05cf994f1 100644
--- a/src/libs/qmuparser/qmuformulabase.cpp
+++ b/src/libs/qmuparser/qmuformulabase.cpp
@@ -76,7 +76,7 @@ void QmuFormulaBase::InitCharSets()
 
     // Defining identifier character sets
     const QString nameChars = QString() + sign0 + sign1 + sign2 + sign3 + sign4 + sign5 + sign6 + sign7 + sign8 +
-            sign9 + QLatin1String("_@#'") + symbols.join("");
+            sign9 + QLatin1String("\\_@#'") + symbols.join("");
     DefineNameChars(nameChars);
 
     const QString oprtChars = symbols.join("") + positiveSign + negativeSign + QLatin1String("*^/?<>=!$%&|~'_");