diff --git a/curl.sh b/curl.sh
index e7dd9f944..b0b3b8abf 100755
--- a/curl.sh
+++ b/curl.sh
@@ -375,7 +375,7 @@ _VER="$1"
 
   patch="../${_NAM}${_PATCHSUFFIX}.patch"
   if [ -f "${patch}" ]; then
-    patchstamp="$(grep -E -o '[a-f0-9]{32,}' "${patch}" | cut -c -8 | tr $'\n' ' ' | sed -e 's/ $//')"
+    patchstamp="$(grep -E -o '[a-f0-9]{32,}' "${patch}" | cut -c -8 | tr $'\n' ',' | sed -e 's/,$//')"
     [ -n "${patchstamp}" ] && CPPFLAGS+=" -DCURL_PATCHSTAMP=\\\"${patchstamp}\\\""
   fi