diff --git a/acinclude.m4 b/acinclude.m4
index bf97b94cb7e50fab4da9dae28782d39b394531ff..3a3122d5804ca0ad27fbaf2f021583c785652f14 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -51,7 +51,7 @@ CURL_DEF_TOKEN $1
   ],[
     tmp_exp=`eval "$ac_cpp conftest.$ac_ext" 2>/dev/null | \
       "$GREP" CURL_DEF_TOKEN 2>/dev/null | \
-      "$SED" 's/.*CURL_DEF_TOKEN[[ ]]//' 2>/dev/null | \
+      "$SED" 's/.*CURL_DEF_TOKEN[[ ]][[ ]]*//' 2>/dev/null | \
       "$SED" 's/[["]][[ ]]*[["]]//g' 2>/dev/null`
     if test -z "$tmp_exp" || test "$tmp_exp" = "$1"; then
       tmp_exp=""