diff --git a/equi.c b/equi.c
index a7ab19f..d3dd08c 100644
--- a/equi.c
+++ b/equi.c
@@ -565,7 +565,7 @@ int main(int argc, char* argv[]) {
     } else if(!ram.II && (instr == 0xFFU || instr == INS_QUIT)) { /* if not in II mode, process EOF or Q instruction: trigger interpreter loop */
       cputc(CR); /* echo CR */
       cputc(LF); /* echo LF */
-      ram.cmdbuf[+ram.ibp] = 0; /* end program with 0 */
+      ram.cmdbuf[++ram.ibp] = INS_QUIT; /* end program with INS_QUIT */
       ram.IM = 1; /* set the mandatory interpretation mode flag */
       equi_main_loop(); /* and run the interpreter loop */
       cputc(CR); /* echo CR */