diff --git a/client/tinycbor/open_memstream.c b/client/tinycbor/open_memstream.c
index 0085641f9..043079143 100644
--- a/client/tinycbor/open_memstream.c
+++ b/client/tinycbor/open_memstream.c
@@ -65,11 +65,15 @@ static RetType write_to_buffer(void *cookie, const char *data, LenType len) {
     if (newsize >= b->alloc) { // NB! one extra byte is needed to avoid buffer overflow at close_buffer
         // make room
         size_t newalloc = newsize + newsize / 2 + 1;    // give 50% more room
-        ptr = realloc(ptr, newalloc);
-        if (ptr == NULL) {
+        
+        char *tmp = realloc(ptr, newalloc);
+        if ( tmp == NULL ) {
             free(ptr);
             return -1;
-        )
+        } else {
+            ptr = tmp;
+        }
+        
         b->alloc = newalloc;
         *b->ptr = ptr;
     }