diff --git a/lib.c b/lib.c
index 99eb54c..78ab5fc 100644
--- a/lib.c
+++ b/lib.c
@@ -36,6 +36,10 @@
 #define unlikely(x) (!!(x))
 #endif
 
+#ifndef MAX_MAIN_SIZE
+#define MAX_MAIN_SIZE 256
+#endif
+
 struct label {
 	int active;
 	int dest;
@@ -1083,7 +1087,7 @@ int ink_step(struct context *pContext) {
 int ink_compile(struct context *pContext, const char* buffer) {
 	int routine, saved, executable_buffer_top;
 	/* Main function has a size limit of 256 (need to know that for REPL */
-	struct elem executable_buffer[256];
+	struct elem executable_buffer[MAX_MAIN_SIZE];
 	struct ink_routine* currentRoutine;
 	int err;
 	struct stack_frame frame;