diff --git a/0001-Fix-wrong-porting-of-KNSCore-Engine-configSearchLoca.patch b/0001-Fix-wrong-porting-of-KNSCore-Engine-configSearchLoca.patch
new file mode 100644
index 0000000..11432ac
--- /dev/null
+++ b/0001-Fix-wrong-porting-of-KNSCore-Engine-configSearchLoca.patch
@@ -0,0 +1,46 @@
+From 675802e706a737c008aa74600ac804b06db52140 Mon Sep 17 00:00:00 2001
+From: Alexander Lohnau <alexander.lohnau@gmx.de>
+Date: Tue, 11 Jan 2022 06:42:03 +0100
+Subject: [PATCH] Fix wrong porting of KNSCore::Engine::configSearchLocations
+
+The `KNSCore::Engine::availableConfigFiles` method returns the file names, but
+the code still assumed that the directories where the file is contained is returned.
+Consequently the knsrc files would never be found.
+
+BUG: 448237
+---
+ src/kpackage-install-handlers/kns/main.cpp | 15 +++++++--------
+ 1 file changed, 7 insertions(+), 8 deletions(-)
+
+diff --git a/src/kpackage-install-handlers/kns/main.cpp b/src/kpackage-install-handlers/kns/main.cpp
+index 9978844..a2b530e 100644
+--- a/src/kpackage-install-handlers/kns/main.cpp
++++ b/src/kpackage-install-handlers/kns/main.cpp
+@@ -70,17 +70,16 @@ int main(int argc, char **argv)
+     Q_ASSERT(url.scheme() == QLatin1String("kns"));
+ 
+     QString knsname;
+-    for (const auto &location : KNSCore::Engine::availableConfigFiles()) {
+-        QString candidate = location + QLatin1Char('/') + url.host();
+-        if (QFile::exists(candidate)) {
+-            knsname = candidate;
+-            break;
+-        }
+-    }
++    const QStringList availableConfigFiles = KNSCore::Engine::availableConfigFiles();
++    auto knsNameIt = std::find_if(availableConfigFiles.begin(), availableConfigFiles.end(), [&url](const QString &availableFile) {
++        return availableFile.endsWith(QLatin1String("/") + url.host());
++    });
+ 
+-    if (knsname.isEmpty()) {
++    if (knsNameIt == availableConfigFiles.end()) {
+         qWarning() << "couldn't find knsrc file for" << url.host();
+         return 1;
++    } else {
++        knsname = *knsNameIt;
+     }
+ 
+     const auto pathParts = url.path().split(QLatin1Char('/'), Qt::SkipEmptyParts);
+-- 
+2.34.1
+
diff --git a/frameworkintegration.changes b/frameworkintegration.changes
index 99fb6e2..d766480 100644
--- a/frameworkintegration.changes
+++ b/frameworkintegration.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Jan 12 14:17:20 UTC 2022 - Christophe Giboudeaux <christophe@krop.fr>
+
+- Add upstream change to fix a regression in 5.90.0 (kde#448237)
+  * 0001-Fix-wrong-porting-of-KNSCore-Engine-configSearchLoca.patch
+
 -------------------------------------------------------------------
 Mon Jan  3 12:47:11 UTC 2022 - Christophe Giboudeaux <christophe@krop.fr>
 
diff --git a/frameworkintegration.spec b/frameworkintegration.spec
index 7cfffb2..173fb7f 100644
--- a/frameworkintegration.spec
+++ b/frameworkintegration.spec
@@ -36,6 +36,8 @@ Source:         %{name}-%{version}.tar.xz
 Source1:        %{name}-%{version}.tar.xz.sig
 Source2:        frameworks.keyring
 %endif
+# PATCH-FIX-UPSTREAM
+Patch0:         0001-Fix-wrong-porting-of-KNSCore-Engine-configSearchLoca.patch
 BuildRequires:  extra-cmake-modules >= %{_kf5_bugfix_version}
 BuildRequires:  fdupes
 BuildRequires:  kf5-filesystem