diff --git a/desktop/kde/applications/libksieve/files/qt5.patch b/desktop/kde/applications/libksieve/files/qt5.patch
new file mode 100644
index 0000000000..1cc238c3b3
--- /dev/null
+++ b/desktop/kde/applications/libksieve/files/qt5.patch
@@ -0,0 +1,35 @@
+diff -Nuar a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt	2017-12-08 04:04:12.000000000 +0300
++++ b/CMakeLists.txt	2017-12-16 23:59:08.782150823 +0300
+@@ -26,7 +26,7 @@
+ include(ECMCoverageOption)
+ 
+ set(LIBKSIEVE_LIB_VERSION ${PIM_VERSION})
+-set(QT_REQUIRED_VERSION "5.8.0")
++set(QT_REQUIRED_VERSION "5.7.1")
+ set(KMIME_LIB_VERSION "5.7.0")
+ set(IDENTITYMANAGEMENT_LIB_VERSION "5.7.0")
+ set(KMAILTRANSPORT_LIB_VERSION "5.7.0")
+diff -Nuar a/src/parser/lexer.cpp b/src/parser/lexer.cpp
+--- a/src/parser/lexer.cpp	2017-12-04 13:20:12.000000000 +0300
++++ b/src/parser/lexer.cpp	2017-12-17 00:05:50.587121831 +0300
+@@ -294,7 +294,9 @@
+             // and CRLF! That should be preserved somehow...
+             return MultiLineString;
+         }
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     default: // Identifier (first must not be 0-9, and can't (caught by Number above))
+         if (!isIText(*mState.cursor)) {
+             makeError(Error::IllegalCharacter);
+@@ -688,7 +690,9 @@
+             if (atEnd()) {
+                 break;
+             }
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         default:
+             if (!is8Bit(*mState.cursor)) {
+                 result += QLatin1Char(*mState.cursor++);
diff --git a/desktop/kde/applications/libksieve/pspec.xml b/desktop/kde/applications/libksieve/pspec.xml
index 749137e3e5..b1955b1f66 100644
--- a/desktop/kde/applications/libksieve/pspec.xml
+++ b/desktop/kde/applications/libksieve/pspec.xml
@@ -46,6 +46,9 @@
             <Dependency>akonadi-mime-devel</Dependency>
             <Dependency>syntax-highlighting-devel</Dependency>
         </BuildDependencies>
+        <Patches>
+            <Patch>qt5.patch</Patch>
+        </Patches>
     </Source>
 
     <Package>
@@ -102,7 +105,7 @@
 
     <History>
         <Update release="13">
-            <Date>2017-12-15</Date>
+            <Date>2017-12-16</Date>
             <Version>17.12.0</Version>
             <Comment>Version bump.</Comment>
             <Name>Mustafa Cinasal</Name>