diff --git a/src/plugins/coreplugin/fileutils.cpp b/src/plugins/coreplugin/fileutils.cpp
index edf63c90a92..aa4ce215be5 100644
--- a/src/plugins/coreplugin/fileutils.cpp
+++ b/src/plugins/coreplugin/fileutils.cpp
@@ -138,7 +138,7 @@ static void startTerminalEmulator(const QString &workingDir, const Environment &
         }
         return programName;
     };
-    const QString cmdLine = quoteWinCommand(QString::fromLocal8Bit(qgetenv("COMSPEC")));
+    const QString cmdLine = quoteWinCommand(qtcEnvironmentVariable("COMSPEC"));
     // cmdLine is assumed to be detached -
     // https://blogs.msdn.microsoft.com/oldnewthing/20090601-00/?p=18083
 
diff --git a/src/plugins/coreplugin/icore.cpp b/src/plugins/coreplugin/icore.cpp
index ec60c434f54..b51276aec7f 100644
--- a/src/plugins/coreplugin/icore.cpp
+++ b/src/plugins/coreplugin/icore.cpp
@@ -12,8 +12,9 @@
 #include <extensionsystem/pluginmanager.h>
 
 #include <utils/algorithm.h>
-#include <utils/qtcassert.h>
+#include <utils/environment.h>
 #include <utils/fileutils.h>
+#include <utils/qtcassert.h>
 
 #include <QApplication>
 #include <QDebug>
@@ -856,9 +857,9 @@ QString ICore::systemInformation()
      return result;
 }
 
-static const QByteArray &screenShotsPath()
+static const QString &screenShotsPath()
 {
-    static const QByteArray path = qgetenv("QTC_SCREENSHOTS_PATH");
+    static const QString path = qtcEnvironmentVariable("QTC_SCREENSHOTS_PATH");
     return path;
 }
 
diff --git a/src/plugins/coreplugin/loggingmanager.cpp b/src/plugins/coreplugin/loggingmanager.cpp
index c10d583b041..5f2fadfb9d4 100644
--- a/src/plugins/coreplugin/loggingmanager.cpp
+++ b/src/plugins/coreplugin/loggingmanager.cpp
@@ -3,6 +3,7 @@
 
 #include "loggingmanager.h"
 
+#include <utils/environment.h>
 #include <utils/filepath.h>
 
 #include <QCoreApplication>
@@ -18,6 +19,8 @@
 //             Using static functions of QLoggingCategory may cause dead locks as well.
 //
 
+using namespace Utils;
+
 namespace Core {
 namespace Internal {
 
@@ -111,12 +114,12 @@ static QList<FilterRuleSpec> fetchOriginalRules()
     if (!qtProjectString.isEmpty())
         appendRulesFromFile(qtProjectString);
 
-    iniFile = Utils::FilePath::fromString(qEnvironmentVariable("QT_LOGGING_CONF"));
+    iniFile = Utils::FilePath::fromString(qtcEnvironmentVariable("QT_LOGGING_CONF"));
     if (iniFile.exists())
         appendRulesFromFile(iniFile.toString());
 
-    if (qEnvironmentVariableIsSet("QT_LOGGING_RULES")) {
-        const QStringList rulesStrings = qEnvironmentVariable("QT_LOGGING_RULES").split(';');
+    if (qtcEnvironmentVariableIsSet("QT_LOGGING_RULES")) {
+        const QStringList rulesStrings = qtcEnvironmentVariable("QT_LOGGING_RULES").split(';');
         for (const QString &rule : rulesStrings) {
             FilterRuleSpec filterRule;
             if (parseLine(rule, &filterRule))
@@ -128,7 +131,7 @@ static QList<FilterRuleSpec> fetchOriginalRules()
 
 LoggingViewManager::LoggingViewManager(QObject *parent)
     : QObject(parent)
-    , m_originalLoggingRules(qEnvironmentVariable("QT_LOGGING_RULES"))
+    , m_originalLoggingRules(qtcEnvironmentVariable("QT_LOGGING_RULES"))
 {
     qRegisterMetaType<Core::Internal::LoggingCategoryEntry>();
     s_instance = this;