diff --git a/src/libstrongswan/utils/lexparser.c b/src/libstrongswan/utils/lexparser.c
index e3bb3d1f9..c09da14b9 100644
--- a/src/libstrongswan/utils/lexparser.c
+++ b/src/libstrongswan/utils/lexparser.c
@@ -110,6 +110,7 @@ err_t extract_value(chunk_t *value, chunk_t *line)
 		if (delimiter == ' ')
 		{
 			*value = *line;
+			line->len = 0;
 		}
 		else
 		{