diff --git a/_parts/part1.md b/_parts/part1.md
index 7b2a365..9a9148c 100644
--- a/_parts/part1.md
+++ b/_parts/part1.md
@@ -184,7 +184,7 @@ typedef struct {
 } InputBuffer;
 
 InputBuffer* new_input_buffer() {
-  InputBuffer* input_buffer = malloc(sizeof(InputBuffer));
+  InputBuffer* input_buffer = (InputBuffer*)malloc(sizeof(InputBuffer));
   input_buffer->buffer = NULL;
   input_buffer->buffer_length = 0;
   input_buffer->input_length = 0;