diff --git a/adm_local/unix/config_files/check_qt.m4 b/adm_local/unix/config_files/check_qt.m4
index d98fff260..0f28aef7d 100644
--- a/adm_local/unix/config_files/check_qt.m4
+++ b/adm_local/unix/config_files/check_qt.m4
@@ -51,6 +51,8 @@ fi
 
 qt_ok=yes
 
+QTDIR=$(echo $QTDIR | sed 's%[/]\+$%%')
+
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS