diff --git a/configure.ac b/configure.ac
index 9f8dd04a..e93862ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -128,6 +128,8 @@ then
 fi
 
 # checking for TurboJPEG
+if ! test -z "$enable_tpeg"
+then
 if test ! -z "$TURBOJPEG_PATH"
 then
   # env var TURBOJPEG_PATH has been defined, use that
@@ -153,6 +155,7 @@ else
   AC_SUBST(TurboJpegIncDir, [""])
   AC_SUBST(TurboJpegLibDir, [""])
 fi
+fi
 
 # checking for Xlib, Xfixes
 AC_CHECK_HEADER([X11/Xlib.h], [],