diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 335f59d..42f57e9 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -167,7 +167,7 @@
 get_config_value_or_default() {
     NAME="$1"
     DEF_VAL=$( grep ".*#define.*${NAME}" ../include/mbedtls/config.h |
-               sed 's/^.*\s\([0-9]*\)$/\1/' )
+               sed 's/^.* \([0-9]*\)$/\1/' )
     ../scripts/config.pl get $NAME || echo "$DEF_VAL"
 }