diff --git a/src/njs_vm.h b/src/njs_vm.h
index 3e21fdf25..9c66c701c 100644
--- a/src/njs_vm.h
+++ b/src/njs_vm.h
@@ -8,7 +8,7 @@
 #define _NJS_VM_H_INCLUDED_
 
 
-#define NJS_MAX_STACK_SIZE       (64 * 1024)
+#define NJS_MAX_STACK_SIZE       (256 * 1024)
 
 
 typedef struct njs_frame_s            njs_frame_t;