diff --git a/src/runtime/cgocall.go b/src/runtime/cgocall.go
index 0e287d0b8e..8ffb48a888 100644
--- a/src/runtime/cgocall.go
+++ b/src/runtime/cgocall.go
@@ -110,6 +110,8 @@ func syscall_cgocaller(fn unsafe.Pointer, args ...uintptr) uintptr {
 	return as.retval
 }
 
+var ncgocall uint64 // number of cgo calls in total for dead m
+
 // Call from Go to C.
 //
 // This must be nosplit because it's used for syscalls on some
diff --git a/src/runtime/debug.go b/src/runtime/debug.go
index f411b22676..82deefa200 100644
--- a/src/runtime/debug.go
+++ b/src/runtime/debug.go
@@ -45,7 +45,7 @@ func NumCPU() int {
 
 // NumCgoCall returns the number of cgo calls made by the current process.
 func NumCgoCall() int64 {
-	var n int64
+	var n = int64(atomic.Load64(&ncgocall))
 	for mp := (*m)(atomic.Loadp(unsafe.Pointer(&allm))); mp != nil; mp = mp.alllink {
 		n += int64(mp.ncgocall)
 	}
diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index 8f1a443945..4c92588a66 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -1522,6 +1522,8 @@ found:
 	}
 	unlock(&sched.lock)
 
+	atomic.Xadd64(&ncgocall, int64(m.ncgocall))
+
 	// Release the P.
 	handoffp(releasep())
 	// After this point we must not have write barriers.