diff --git a/desktop/kde/applications/kalarmcal/files/qt5.patch b/desktop/kde/applications/kalarmcal/files/qt5.patch
new file mode 100644
index 0000000000..3b7689fa8a
--- /dev/null
+++ b/desktop/kde/applications/kalarmcal/files/qt5.patch
@@ -0,0 +1,183 @@
+diff -Nuar a/src/kaevent.cpp b/src/kaevent.cpp
+--- a/src/kaevent.cpp	2017-12-04 13:20:32.000000000 +0300
++++ b/src/kaevent.cpp	2017-12-16 21:09:56.797883339 +0300
+@@ -917,7 +917,9 @@
+                 break;
+             }
+             // Fall through to AUDIO_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         case AUDIO_ALARM:
+             mAudioFile   = data.cleanText;
+             mSpeak       = data.speak  &&  mAudioFile.isEmpty();
+@@ -992,7 +994,9 @@
+                 noSetNextTime = true;
+             }
+             // fall through to REMINDER_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         case REMINDER_ALARM:
+         case AT_LOGIN_ALARM:
+         case DISPLAYING_ALARM:
+@@ -1000,7 +1004,9 @@
+                 mNextMainDateTime = alTime;
+             }
+             // fall through to MAIN_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         case MAIN_ALARM:
+             // Ensure that the basic fields are set up even if there is no main
+             // alarm in the event (if it has expired and then been deferred)
+@@ -1014,7 +1020,9 @@
+                         break;
+                     }
+                     // fall through to MESSAGE
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+                     Q_FALLTHROUGH();
++#endif
+                 case KAAlarm::MESSAGE:
+                     mFont           = data.font;
+                     mUseDefaultFont = data.defaultFont;
+@@ -1022,7 +1030,9 @@
+                         isEmailText = true;
+                     }
+                     // fall through to FILE
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+                     Q_FALLTHROUGH();
++#endif
+                 case KAAlarm::FILE:
+                     mBgColour = data.bgColour;
+                     mFgColour = data.fgColour;
+@@ -1552,7 +1562,9 @@
+         if (mRepetition)
+             alarm->setCustomProperty(KACalendar::APPNAME, NEXT_REPEAT_PROPERTY,
+                                      QString::number(mNextRepeat));
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case REMINDER_ALARM:
+     case INVALID_ALARM: {
+         if (types == QStringList(REMINDER_TYPE)
+@@ -1566,7 +1578,9 @@
+         case KAEvent::FILE:
+             alltypes += FILE_TYPE;
+             // fall through to MESSAGE
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         case KAEvent::MESSAGE:
+             alarm->setDisplayAlarm(AlarmText::toCalendarText(mText));
+             display = true;
+@@ -3503,7 +3517,9 @@
+                 break;
+             }
+             // fall through to DEFERRED_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         case KAAlarm::DEFERRED_ALARM:
+             if (mDeferral != NO_DEFERRAL) {
+                 al_d->mType             = (mDeferral == REMINDER_DEFERRAL) ? KAAlarm::DEFERRED_REMINDER_ALARM : KAAlarm::DEFERRED_ALARM;
+@@ -3579,7 +3595,9 @@
+             return alarm(KAAlarm::REMINDER_ALARM);
+         }
+         // fall through to REMINDER_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case KAAlarm::REMINDER_ALARM:
+         // There can only be one deferral alarm
+         if (mDeferral == REMINDER_DEFERRAL) {
+@@ -3589,20 +3607,26 @@
+             return alarm(KAAlarm::DEFERRED_ALARM);
+         }
+         // fall through to DEFERRED_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case KAAlarm::DEFERRED_REMINDER_ALARM:
+     case KAAlarm::DEFERRED_ALARM:
+         if (mRepeatAtLogin) {
+             return alarm(KAAlarm::AT_LOGIN_ALARM);
+         }
+         // fall through to AT_LOGIN_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case KAAlarm::AT_LOGIN_ALARM:
+         if (mDisplaying) {
+             return alarm(KAAlarm::DISPLAYING_ALARM);
+         }
+         // fall through to DISPLAYING_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case KAAlarm::DISPLAYING_ALARM:
+     // fall through to default
+     case KAAlarm::INVALID_ALARM:
+@@ -3646,7 +3670,9 @@
+             --mAlarmCount;
+         }
+         // fall through to AT_LOGIN_ALARM
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case KAAlarm::AT_LOGIN_ALARM:
+         if (mRepeatAtLogin) {
+             // Remove the at-login alarm, but keep a note of it for archiving purposes
+@@ -3969,7 +3995,9 @@
+             break;
+         }
+         // fall through to Display
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case Alarm::Display: {
+         if (alarm->type() == Alarm::Display) {
+             data.action    = KAAlarm::MESSAGE;
+@@ -5014,7 +5042,9 @@
+                 case KAAlarm::FILE:
+                     types += KAEventPrivate::FILE_TYPE;
+                     // fall through to MESSAGE
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+                     Q_FALLTHROUGH();
++#endif
+                 case KAAlarm::MESSAGE:
+                     alarm->setDisplayAlarm(altxt);
+                     break;
+@@ -5873,7 +5903,9 @@
+                     break;
+                 }
+                 // fall through to default
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+                 Q_FALLTHROUGH();
++#endif
+             default:
+                 command += ch;
+                 break;
+diff -Nuar a/src/karecurrence.cpp b/src/karecurrence.cpp
+--- a/src/karecurrence.cpp	2017-12-04 13:20:32.000000000 +0300
++++ b/src/karecurrence.cpp	2017-12-16 21:24:22.815820852 +0300
+@@ -319,7 +319,9 @@
+             // Convert an hourly recurrence to a minutely one
+             rrule->setRecurrenceType(RecurrenceRule::rMinutely);
+             rrule->setFrequency(rrule->frequency() * 60);
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+             Q_FALLTHROUGH();
++#endif
+         // fall through to rMinutely
+         case Recurrence::rMinutely:
+         case Recurrence::rDaily:
+@@ -493,7 +495,9 @@
+             break;
+         }
+         // fall through to rWeekly
++#if QT_VERSION >= QT_VERSION_CHECK(5,8,0)
+         Q_FALLTHROUGH();
++#endif
+     case WEEKLY:
+     case MONTHLY_POS:
+         recur.defaultRRule(true)->setByDays(rrule->byDays());
diff --git a/desktop/kde/applications/kalarmcal/pspec.xml b/desktop/kde/applications/kalarmcal/pspec.xml
index 3824abd9af..42613fb134 100644
--- a/desktop/kde/applications/kalarmcal/pspec.xml
+++ b/desktop/kde/applications/kalarmcal/pspec.xml
@@ -32,6 +32,9 @@
             <Dependency>kholidays-devel</Dependency>
             <Dependency>extra-cmake-modules</Dependency>
         </BuildDependencies>
+        <Patches>
+            <Patch>qt5.patch</Patch>
+        </Patches>
     </Source>
 
     <Package>