diff --git a/startkde/startplasma.cpp b/startkde/startplasma.cpp
--- a/startkde/startplasma.cpp
+++ b/startkde/startplasma.cpp
@@ -179,6 +179,10 @@
 // (where <config locations> correspond to the system and user's configuration
 // directory.
 //
+// Scripts that belong to the user's configuration directory are sourced *after*
+// those belonging to the system directory. For each directory (system and user),
+// scripts are sourced in lexical order of their filename.
+//
 // This is where you can define environment variables that will be available to
 // all KDE programs, so this is where you can run agents using e.g. eval `ssh-agent`
 // or eval `gpg-agent --daemon`.
@@ -190,19 +194,45 @@
 
 void runEnvironmentScripts()
 {
-    QStringList scripts;
-    const auto locations = QStandardPaths::locateAll(QStandardPaths::GenericConfigLocation, QStringLiteral("plasma-workspace/env"), QStandardPaths::LocateDirectory);
+    const auto locations = QStandardPaths::locateAll(QStandardPaths::GenericConfigLocation,
+            QStringLiteral("plasma-workspace/env"), QStandardPaths::LocateDirectory);
+
+    QFileInfoList userScripts;
+    QFileInfoList systemScripts;
     for (const QString & location : locations) {
+        // check if location belongs to user's home directory
+        bool dirIsUser = location.startsWith(QDir::homePath());
+
         QDir dir(location);
         const auto dirScripts = dir.entryInfoList({QStringLiteral("*.sh")});
         for (const auto script : dirScripts) {
-            scripts << script.absoluteFilePath();
+            if (dirIsUser) {
+                userScripts << script;
+            } else {
+                systemScripts << script;
+            }
         }
     }
+
+    // Lambda used to sort QFileInfo objects by their filename instead of full path
+    auto compareFileName = [](const QFileInfo a, const QFileInfo b)
+        -> bool { return a.fileName() < b.fileName(); };
+
+    QStringList scripts;
+    // Add all system scripts, sorted lexically by filename
+    std::sort(systemScripts.begin(), systemScripts.end(), compareFileName);
+    for (const auto script: systemScripts) {
+        scripts << script.absoluteFilePath();
+    }
+    // Add all user scripts, sorted lexically by filename
+    std::sort(userScripts.begin(), userScripts.end(), compareFileName);
+    for (const auto script: userScripts) {
+        scripts << script.absoluteFilePath();
+    }
+
     sourceFiles(scripts);
 }
 
-
 // Mark that full KDE session is running (e.g. Konqueror preloading works only
 // with full KDE running). The KDE_FULL_SESSION property can be detected by
 // any X client connected to the same X session, even if not launched