diff --git a/desktop/kde/applications/kmime/files/qt5.patch b/desktop/kde/applications/kmime/files/qt5.patch
new file mode 100644
index 0000000000..9853aba027
--- /dev/null
+++ b/desktop/kde/applications/kmime/files/qt5.patch
@@ -0,0 +1,49 @@
+diff -Nuar a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt	2017-12-08 04:01:51.000000000 +0300
++++ b/CMakeLists.txt	2017-12-16 13:52:00.845672814 +0300
+@@ -22,7 +22,7 @@
+ 
+ 
+ set(KMIME_LIB_VERSION ${PIM_VERSION})
+-set(QT_REQUIRED_VERSION "5.8.0")
++set(QT_REQUIRED_VERSION "5.7.1")
+ find_package(Qt5 ${QT_REQUIRED_VERSION} CONFIG REQUIRED Core)
+ 
+ ecm_setup_version(PROJECT VARIABLE_PREFIX KMIME
+diff -Nuar a/src/kmime_header_parsing.cpp b/src/kmime_header_parsing.cpp
+--- a/src/kmime_header_parsing.cpp	2017-12-02 10:23:33.000000000 +0300
++++ b/src/kmime_header_parsing.cpp	2017-12-16 14:10:14.307593916 +0300
+@@ -452,7 +452,9 @@
+                 scursor = oldscursor;
+             }
+             // fall through
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         }
+         default:
+             KMIME_WARN_IF_8BIT(ch);
+@@ -636,7 +638,9 @@
+                 // parse as atom:
+                 scursor = oldscursor;
+             }
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+             // fall though...
+ 
+         default: //atom
+diff -Nuar a/src/kmime_util.cpp b/src/kmime_util.cpp
+--- a/src/kmime_util.cpp	2017-12-02 10:23:33.000000000 +0300
++++ b/src/kmime_util.cpp	2017-12-16 14:06:40.956609310 +0300
+@@ -98,10 +98,8 @@
+     switch (cf.type()) {
+     case CharFreq::SevenBitText:
+         allowed << Headers::CE7Bit;
+-        Q_FALLTHROUGH();
+     case CharFreq::EightBitText:
+         allowed << Headers::CE8Bit;
+-        Q_FALLTHROUGH();
+     case CharFreq::SevenBitData:
+         if (cf.printableRatio() > 5.0 / 6.0) {
+             // let n the length of data and p the number of printable chars.
diff --git a/desktop/kde/applications/kmime/pspec.xml b/desktop/kde/applications/kmime/pspec.xml
index d504a5627e..6e74f330e2 100644
--- a/desktop/kde/applications/kmime/pspec.xml
+++ b/desktop/kde/applications/kmime/pspec.xml
@@ -23,6 +23,9 @@
             <Dependency>kdoctools-devel</Dependency>
             <Dependency>kdelibs4-support-devel</Dependency>
         </BuildDependencies>
+        <Patches>
+            <Patch>qt5.patch</Patch>
+        </Patches>
     </Source>
 
     <Package>
@@ -58,7 +61,7 @@
 
     <History>
         <Update release="14">
-            <Date>2017-12-15</Date>
+            <Date>2017-12-16</Date>
             <Version>17.12.0</Version>
             <Comment>Version bump.</Comment>
             <Name>Mustafa Cinasal</Name>