diff --git a/configure.ac b/configure.ac
index 0df2d460c61e97905a0903915fb839978b133dad..f8a618d1cc4dc12c517f0c3d6994b4adaa136c1f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,7 +44,7 @@ case "${host_os}" in
     ;;
 esac
 
-AM_CONDITIONAL(WIN32, [test x"$SYS" = mingw32])
+AM_CONDITIONAL(WIN32, [test "x$SYS" = "xmingw32"])
 AS_IF([test "x$SYS" = "xandroid"],
       [], [LDFLAGS="${LDFLAGS} -lpthread"])