diff --git a/acinclude.m4 b/acinclude.m4
index efbf0c2..107afb5 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -6753,7 +6753,7 @@ AC_DEFUN([AC_PDF_GENERATION], [
 dnl Macro to check for KDChart include and library files
 dnl Availability of KDChart defaults to 'no'
 
-AC_DEFUN([AC_QTDESIGNER_SUPPORT],
+AC_DEFUN([AC_TQTDESIGNER_SUPPORT],
 [
 AC_MSG_CHECKING([if library for Qt-Designer widgets should be installed])
 AC_ARG_ENABLE(qtdesigner,
@@ -6766,7 +6766,7 @@ AC_ARG_ENABLE(qtdesigner,
     enable_qtdesigner="no"
     AC_MSG_RESULT($enable_qtdesigner)
   ])
-  AM_CONDITIONAL(INSTALL_QTDESIGNER_SUPPORT, test "$enable_qtdesigner" = "yes")
+  AM_CONDITIONAL(INSTALL_TQTDESIGNER_SUPPORT, test "$enable_qtdesigner" = "yes")
 ])
 # sqlite3.m4
 # ----------