diff --git a/configure.ac b/configure.ac
index 44a31ce5..aec2f555 100644
--- a/configure.ac
+++ b/configure.ac
@@ -353,11 +353,11 @@ AC_ARG_ENABLE(multi-os-directory,
 if test "x$GCC" = "xyes"; then
   if test -n "$with_cross_host" &&
      test x"$with_cross_host" != x"no"; then
-    toolexecdir="${exec_prefix}"/'$(target_alias)'
-    toolexeclibdir="${toolexecdir}"/lib
+    toolexecdir='${exec_prefix}'/'$(target_alias)'
+    toolexeclibdir='${toolexecdir}'/lib
   else
-    toolexecdir="${libdir}"/gcc-lib/'$(target_alias)'
-    toolexeclibdir="${libdir}"
+    toolexecdir='${libdir}'/gcc-lib/'$(target_alias)'
+    toolexeclibdir='${libdir}'
   fi
   if test x"$enable_multi_os_directory" != x"no"; then
     multi_os_directory=`$CC $CFLAGS -print-multi-os-directory`
@@ -368,7 +368,7 @@ if test "x$GCC" = "xyes"; then
   fi
   AC_SUBST(toolexecdir)
 else
-  toolexeclibdir="${libdir}"
+  toolexeclibdir='${libdir}'
 fi
 AC_SUBST(toolexeclibdir)