diff --git a/configure.ac b/configure.ac
index b8b6dc967cec..69d5e831c696 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3826,7 +3826,7 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 if test "$COM_IS_CLANG" = TRUE; then
     AC_MSG_CHECKING([the Clang version])
     clang_version=`echo __clang_major__.__clang_minor__.__clang_patchlevel__ | $CC -E -P /dev/stdin`
-    CLANG_FULL_VERSION=`echo __clang_version__ | $CC -E -P /dev/stdin`
+    CLANG_FULL_VERSION=`echo __clang_version__ | $CC -E -P -`
     CLANGVER=`echo $clang_version | $AWK -F. '{ print \$1*10000+\$2*100+\$3 }'`
     AC_MSG_RESULT([Clang $CLANG_FULL_VERSION, $CLANGVER])
     AC_DEFINE_UNQUOTED(CLANG_FULL_VERSION,$CLANG_FULL_VERSION)