diff --git a/libisofs/util.c b/libisofs/util.c
index 16ff93c..159ca82 100644
--- a/libisofs/util.c
+++ b/libisofs/util.c
@@ -597,8 +597,10 @@ int str2ucs(const char *icharset, const char *input, uint16_t **output)
         loop_limit = inbytes + 3;
 
         ret_ = malloc((numchars+1) * sizeof(uint16_t));
-        if (ret_ == NULL)
+        if (ret_ == NULL) {
+            free(wsrc_);
             return ISO_OUT_OF_MEM;
+        }
         outbytes = numchars * sizeof(uint16_t);
         ret = ret_;