diff --git a/test/vm/fails/key_size_overflow.js b/test/vm/fails/key_size_overflow.js
index 9daebc924..beb50bed7 100644
--- a/test/vm/fails/key_size_overflow.js
+++ b/test/vm/fails/key_size_overflow.js
@@ -1,3 +1,10 @@
 
+var key = "0123456789ABCDEF";
+
+for(var i = 0; i < 8; ++i) {
+	key = concat(key, key);
+}
+key = concat(key, ".");
+
 var map = {};
-map["A3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964A.A3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964A.A3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964A.A3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964A.A3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964AA3D6C7817001F48946270CD00CE1EA2105F470F65DA66C1FBCAADE3E7CAB964A."] = 1;
+map[key] = 1;
diff --git a/test/vm/fails/value_size_overflow.js b/test/vm/fails/value_size_overflow.js
index 0d0b9a690..52fbbaf2c 100644
--- a/test/vm/fails/value_size_overflow.js
+++ b/test/vm/fails/value_size_overflow.js
@@ -1,7 +1,7 @@
 
 var value = "0123456789ABCDEF";
 
-for(var i = 0; i < 13; ++i) {
+for(var i = 0; i < 29; ++i) {
 	value = concat(value, value);
 }