diff --git a/modules/angular2/src/router/instruction.ts b/modules/angular2/src/router/instruction.ts
index 198c54c27d..492b22bfe5 100644
--- a/modules/angular2/src/router/instruction.ts
+++ b/modules/angular2/src/router/instruction.ts
@@ -137,7 +137,7 @@ export function stringifyInstruction(instruction: Instruction): string {
 
 export function stringifyInstructionPath(instruction: Instruction): string {
   return instruction.component.urlPath + stringifyAux(instruction) +
-         stringifyPrimary(instruction.child);
+         stringifyPrimaryPrefixed(instruction.child);
 }
 
 export function stringifyInstructionQuery(instruction: Instruction): string {
@@ -146,6 +146,14 @@ export function stringifyInstructionQuery(instruction: Instruction): string {
              '';
 }
 
+function stringifyPrimaryPrefixed(instruction: Instruction): string {
+  var primary = stringifyPrimary(instruction);
+  if (primary.length > 0) {
+    primary = '/' + primary;
+  }
+  return primary;
+}
+
 function stringifyPrimary(instruction: Instruction): string {
   if (isBlank(instruction)) {
     return '';
@@ -153,8 +161,8 @@ function stringifyPrimary(instruction: Instruction): string {
   var params = instruction.component.urlParams.length > 0 ?
                    (';' + instruction.component.urlParams.join(';')) :
                    '';
-  return '/' + instruction.component.urlPath + params + stringifyAux(instruction) +
-         stringifyPrimary(instruction.child);
+  return instruction.component.urlPath + params + stringifyAux(instruction) +
+         stringifyPrimaryPrefixed(instruction.child);
 }
 
 function stringifyAux(instruction: Instruction): string {