diff --git a/src/runtime/cpuprof.go b/src/runtime/cpuprof.go
index 53082006d0..b2c8ac8459 100644
--- a/src/runtime/cpuprof.go
+++ b/src/runtime/cpuprof.go
@@ -4,7 +4,7 @@
 
 // CPU profiling.
 // Based on algorithms and data structures used in
-// http://code.google.com/p/google-perftools/.
+// https://github.com/google/pprof.
 //
 // The main difference between this code and the google-perftools
 // code is that this code is written to allow copying the profile data