diff --git a/boot.c b/boot.c
index 4a7b5b0..eb71c13 100644
--- a/boot.c
+++ b/boot.c
@@ -484,12 +484,15 @@ void next_token() {
         fprintf(stderr, "unexpected character: %c(%d)\n", ch, ch);
         exit(1);
     }
-    fprintf(stderr, "token: %d\n", token_type);
-    if (token_type == TOKEN_ID) {
-        const char* name = id_table + id_lut[token_data];
-        fprintf(stderr, "  id: %s\n", name);
-    } else if (token_type == TOKEN_NUMBER) {
-        fprintf(stderr, "  number: %d\n", token_data);
+    // debug info
+    if (0) {
+        fprintf(stderr, "token: %d\n", token_type);
+        if (token_type == TOKEN_ID) {
+            const char* name = id_table + id_lut[token_data];
+            fprintf(stderr, "  id: %s\n", name);
+        } else if (token_type == TOKEN_NUMBER) {
+            fprintf(stderr, "  number: %d\n", token_data);
+        }
     }
 }
 
@@ -670,11 +673,17 @@ int declare_local(int id, int type) {
     return local_table[id] = slot;
 }
 
+int array_size_of(int type, int size) {
+    return type == TYPE_CHAR ? size : 4 * size;
+}
+
 int declare_local_array(int id, int type, int size) {
     if (local_table[id] != 0) return local_table[id];
     int slot = next_local_slot(type);
+    int array_size = array_size_of(type, size);
+    int slot_size = (array_size + 7) / 8;
     local_marker[slot] = MARKER_ARRAY;
-    for (int i = 1; i < size; ++i) local_marker[next_local_slot(type)] = MARKER_ARRAY;
+    for (int i = 1; i < slot_size; ++i) local_marker[next_local_slot(type)] = MARKER_ARRAY;
     return local_table[id] = slot;
 }
 
@@ -1841,7 +1850,7 @@ void parse_global_variable(int id, const char* name, int type) {
         expect_token(TOKEN_NUMBER);
         int size = token_data;
         expect_token(TOKEN_BRACKET_RIGHT);
-        int array_size = type == TYPE_CHAR ? size : 4 * size;
+        int array_size = array_size_of(type, size);
         printf("  .zero %d\n", array_size);
         declare_global(id, MARKER_ARRAY, type);
     } else {