diff --git a/src/libs/utils/environment.cpp b/src/libs/utils/environment.cpp
index e0d03a9ab67..e0a19db274d 100644
--- a/src/libs/utils/environment.cpp
+++ b/src/libs/utils/environment.cpp
@@ -391,7 +391,7 @@ QList<EnvironmentItem> Environment::diff(const Environment &other) const
     return result;
 }
 
-bool Environment::hasKey(const QString &key)
+bool Environment::hasKey(const QString &key) const
 {
     return m_values.contains(key);
 }
diff --git a/src/libs/utils/environment.h b/src/libs/utils/environment.h
index b0d5941ff51..46fd72a88c4 100644
--- a/src/libs/utils/environment.h
+++ b/src/libs/utils/environment.h
@@ -77,7 +77,7 @@ public:
     void modify(const QList<EnvironmentItem> &list);
     /// Return the Environment changes necessary to modify this into the other environment.
     QList<EnvironmentItem> diff(const Environment &other) const;
-    bool hasKey(const QString &key);
+    bool hasKey(const QString &key) const;
 
     QString userName() const;