diff --git a/c/chunk.c b/c/chunk.c
index 25380e831..81255a723 100644
--- a/c/chunk.c
+++ b/c/chunk.c
@@ -39,7 +39,7 @@ void writeChunk(Chunk* chunk, uint8_t byte) {
 //> write-chunk-with-line
 void writeChunk(Chunk* chunk, uint8_t byte, int line) {
 //< write-chunk-with-line
-  if (chunk->capacity < chunk->count + 1) {
+  if (chunk->capacity == chunk->count) {
     int oldCapacity = chunk->capacity;
     chunk->capacity = GROW_CAPACITY(oldCapacity);
     chunk->code = GROW_ARRAY(uint8_t, chunk->code,