diff --git a/0001-sddm-theme-lockscreen-Fix-login-button-size.patch b/0001-sddm-theme-lockscreen-Fix-login-button-size.patch
new file mode 100644
index 0000000..6def371
--- /dev/null
+++ b/0001-sddm-theme-lockscreen-Fix-login-button-size.patch
@@ -0,0 +1,45 @@
+From 2f9129410401c2d734aff1602b37be70cebbb74b Mon Sep 17 00:00:00 2001
+From: Noah Davis <noahadvs@gmail.com>
+Date: Mon, 14 Sep 2020 10:18:57 -0400
+Subject: [PATCH] [sddm-theme/lockscreen] Fix login button size
+
+Some users reported this button becoming too small after KF5.74 was released, but I could not reproduce it myself. However, this code did look suspicious. Hopefully this fixes the issue.
+
+(cherry picked from commit 9a8fc811282e303ec2f93c978228a85961dae263)
+---
+ lookandfeel/contents/lockscreen/MainBlock.qml | 3 ++-
+ sddm-theme/Login.qml                          | 4 ++--
+ 2 files changed, 4 insertions(+), 3 deletions(-)
+
+diff --git a/lookandfeel/contents/lockscreen/MainBlock.qml b/lookandfeel/contents/lockscreen/MainBlock.qml
+index 4bd5df0e5..70b43d959 100644
+--- a/lookandfeel/contents/lockscreen/MainBlock.qml
++++ b/lookandfeel/contents/lockscreen/MainBlock.qml
+@@ -97,7 +97,8 @@ SessionManagementScreen {
+         PlasmaComponents.Button {
+             id: loginButton
+             Accessible.name: i18nd("plasma_lookandfeel_org.kde.lookandfeel", "Unlock")
+-            implicitHeight: passwordBox.height - units.smallSpacing * 0.5 // otherwise it comes out taller than the password field
++            Layout.preferredHeight: passwordBox.implicitHeight
++            Layout.preferredWidth: loginButton.Layout.preferredHeight
+ 
+             PlasmaCore.IconItem { // no iconSource because if you take away half a unit (implicitHeight), "go-next" gets cut off
+                     anchors.fill: parent
+diff --git a/sddm-theme/Login.qml b/sddm-theme/Login.qml
+index 49d6805d8..3daaebf57 100644
+--- a/sddm-theme/Login.qml
++++ b/sddm-theme/Login.qml
+@@ -112,8 +112,8 @@ SessionManagementScreen {
+         PlasmaComponents.Button {
+             id: loginButton
+             Accessible.name: i18nd("plasma_lookandfeel_org.kde.lookandfeel", "Log In")
+-            implicitHeight: passwordBox.height - units.smallSpacing * 0.5 // otherwise it comes out taller than the password field
+-            Layout.rightMargin: 1 // prevents it from extending beyond the username field
++            Layout.preferredHeight: passwordBox.implicitHeight
++            Layout.preferredWidth: loginButton.Layout.preferredHeight
+ 
+             PlasmaCore.IconItem { // no iconSource because if you take away half a unit (implicitHeight), "go-next" gets cut off
+                 anchors.fill: parent
+-- 
+2.25.1
+
diff --git a/plasma5-workspace.changes b/plasma5-workspace.changes
index 44d327e..95edeb4 100644
--- a/plasma5-workspace.changes
+++ b/plasma5-workspace.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Sep 16 20:18:17 UTC 2020 - Fabian Vogt <fabian@ritter-vogt.de>
+
+- Add patch to fix login button appearance with KF 5.74:
+  * 0001-sddm-theme-lockscreen-Fix-login-button-size.patch
+
 -------------------------------------------------------------------
 Fri Sep  4 10:42:01 UTC 2020 - Hans-Peter Jansen <hpj@urpla.net>
 
diff --git a/plasma5-workspace.spec b/plasma5-workspace.spec
index 5366c81..078ef55 100644
--- a/plasma5-workspace.spec
+++ b/plasma5-workspace.spec
@@ -50,6 +50,7 @@ Patch503:       0001-Set-GTK_BACKEND-x11-in-a-wayland-session.patch
 Patch506:       0001-Revert-No-icons-on-the-desktop-by-default.patch
 # PATCH-FIX-UPSTREAM
 Patch510:       0001-ksmserver-Use-UpdateLaunchEnvJob-to-sync-SESSION_MAN.patch
+Patch511:       0001-sddm-theme-lockscreen-Fix-login-button-size.patch
 BuildRequires:  breeze5-icons
 BuildRequires:  fdupes
 BuildRequires:  kf5-filesystem