diff --git a/style/qtcurve.cpp b/style/qtcurve.cpp
index 1931c72..90ffd22 100644
--- a/style/qtcurve.cpp
+++ b/style/qtcurve.cpp
@@ -199,7 +199,7 @@ static bool useTQt3Settings()
 #ifdef TQTC_DEFAULT_TO_KDE3
                 : 3;
 #else
-                : getenv("KDE_FULL_SESSION")
+                : getenv("TDE_FULL_SESSION")
                     ? 3
                     : 4;
 #endif