diff --git a/src/main.c b/src/main.c
index 772fb4d..cd24698 100644
--- a/src/main.c
+++ b/src/main.c
@@ -23,7 +23,6 @@ static uint8_t memory[1024 * 128]; // 128 KiB
 
 static mrb_state *mrb = NULL;
 
-static void panic(const char *str);
 static void assert(const char *file, int line, const char *str);
 
 static void *my_calloc(size_t nmemb, size_t size);