diff --git a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
index b5adf4bc09d..4b6ab55d4df 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
@@ -1621,10 +1621,24 @@ bool CMakeBuildConfiguration::fromMap(const QVariantMap &map)
         m_buildSystem->setInitialCMakeArguments(cmd.splitArguments());
     }
 
-    d->m_clearSystemConfigureEnvironment = map.value(QLatin1String(CLEAR_SYSTEM_ENVIRONMENT_KEY))
-                                               .toBool();
+    // Upgrading from Qt Creator version <9 to 9, if the build environment is set
+    // apply the specific values to the configure environment
+    auto settingsKey = [map](const QLatin1String &configureKey, const QLatin1String &buildKey) {
+        if (!map.contains(configureKey) && map.contains(buildKey))
+            return buildKey;
+        return configureKey;
+    };
+
+    const QLatin1String clearSystemEnvironmentKey
+        = settingsKey(QLatin1String(CLEAR_SYSTEM_ENVIRONMENT_KEY),
+                      QLatin1String(ProjectExplorer::Constants::CLEAR_SYSTEM_ENVIRONMENT_KEY));
+    const QLatin1String userEnvironmentChangesKey
+        = settingsKey(QLatin1String(USER_ENVIRONMENT_CHANGES_KEY),
+                      QLatin1String(ProjectExplorer::Constants::USER_ENVIRONMENT_CHANGES_KEY));
+
+    d->m_clearSystemConfigureEnvironment = map.value(clearSystemEnvironmentKey).toBool();
     d->m_userConfigureEnvironmentChanges = EnvironmentItem::fromStringList(
-        map.value(QLatin1String(USER_ENVIRONMENT_CHANGES_KEY)).toStringList());
+        map.value(userEnvironmentChangesKey).toStringList());
 
     updateAndEmitConfigureEnvironmentChanged();
 
diff --git a/src/plugins/projectexplorer/buildconfiguration.cpp b/src/plugins/projectexplorer/buildconfiguration.cpp
index b858fdb4d46..a812eb13b2d 100644
--- a/src/plugins/projectexplorer/buildconfiguration.cpp
+++ b/src/plugins/projectexplorer/buildconfiguration.cpp
@@ -46,8 +46,6 @@ using namespace Utils;
 
 const char BUILD_STEP_LIST_COUNT[] = "ProjectExplorer.BuildConfiguration.BuildStepListCount";
 const char BUILD_STEP_LIST_PREFIX[] = "ProjectExplorer.BuildConfiguration.BuildStepList.";
-const char CLEAR_SYSTEM_ENVIRONMENT_KEY[] = "ProjectExplorer.BuildConfiguration.ClearSystemEnvironment";
-const char USER_ENVIRONMENT_CHANGES_KEY[] = "ProjectExplorer.BuildConfiguration.UserEnvironmentChanges";
 const char CUSTOM_PARSERS_KEY[] = "ProjectExplorer.BuildConfiguration.CustomParsers";
 const char PARSE_STD_OUT_KEY[] = "ProjectExplorer.BuildConfiguration.ParseStandardOutput";
 
@@ -378,8 +376,9 @@ QVariantMap BuildConfiguration::toMap() const
 {
     QVariantMap map = ProjectConfiguration::toMap();
 
-    map.insert(QLatin1String(CLEAR_SYSTEM_ENVIRONMENT_KEY), d->m_clearSystemEnvironment);
-    map.insert(QLatin1String(USER_ENVIRONMENT_CHANGES_KEY), EnvironmentItem::toStringList(d->m_userEnvironmentChanges));
+    map.insert(QLatin1String(Constants::CLEAR_SYSTEM_ENVIRONMENT_KEY), d->m_clearSystemEnvironment);
+    map.insert(QLatin1String(Constants::USER_ENVIRONMENT_CHANGES_KEY),
+               EnvironmentItem::toStringList(d->m_userEnvironmentChanges));
 
     map.insert(QLatin1String(BUILD_STEP_LIST_COUNT), 2);
     map.insert(QLatin1String(BUILD_STEP_LIST_PREFIX) + QString::number(0), d->m_buildSteps.toMap());
@@ -393,8 +392,10 @@ QVariantMap BuildConfiguration::toMap() const
 
 bool BuildConfiguration::fromMap(const QVariantMap &map)
 {
-    d->m_clearSystemEnvironment = map.value(QLatin1String(CLEAR_SYSTEM_ENVIRONMENT_KEY)).toBool();
-    d->m_userEnvironmentChanges = EnvironmentItem::fromStringList(map.value(QLatin1String(USER_ENVIRONMENT_CHANGES_KEY)).toStringList());
+    d->m_clearSystemEnvironment = map.value(QLatin1String(Constants::CLEAR_SYSTEM_ENVIRONMENT_KEY))
+                                      .toBool();
+    d->m_userEnvironmentChanges = EnvironmentItem::fromStringList(
+        map.value(QLatin1String(Constants::USER_ENVIRONMENT_CHANGES_KEY)).toStringList());
 
     updateCacheAndEmitEnvironmentChanged();
 
diff --git a/src/plugins/projectexplorer/projectexplorerconstants.h b/src/plugins/projectexplorer/projectexplorerconstants.h
index ccdb0d44d3a..2ff240b4a3f 100644
--- a/src/plugins/projectexplorer/projectexplorerconstants.h
+++ b/src/plugins/projectexplorer/projectexplorerconstants.h
@@ -219,6 +219,8 @@ const char SETTINGS_MENU_HIDE_BUILD[] = "Menu/HideBuild";
 const char SETTINGS_MENU_HIDE_DEBUG[] = "Menu/HideDebug";
 const char SETTINGS_MENU_HIDE_ANALYZE[] = "Menu/HideAnalyze";
 const char SESSION_TASKFILE_KEY[] = "TaskList.File";
+const char CLEAR_SYSTEM_ENVIRONMENT_KEY[] = "ProjectExplorer.BuildConfiguration.ClearSystemEnvironment";
+const char USER_ENVIRONMENT_CHANGES_KEY[] = "ProjectExplorer.BuildConfiguration.UserEnvironmentChanges";
 
 // UI texts
 PROJECTEXPLORER_EXPORT QString msgAutoDetected();