diff --git a/vendor/github.com/armon/go-metrics/inmem.go b/vendor/github.com/armon/go-metrics/inmem.go
index 4e2d6a7..93b0e0a 100644
--- a/vendor/github.com/armon/go-metrics/inmem.go
+++ b/vendor/github.com/armon/go-metrics/inmem.go
@@ -255,11 +255,11 @@
 	}
 	copyCurrent.Counters = make(map[string]SampledValue, len(current.Counters))
 	for k, v := range current.Counters {
-		copyCurrent.Counters[k] = v
+		copyCurrent.Counters[k] = v.deepCopy()
 	}
 	copyCurrent.Samples = make(map[string]SampledValue, len(current.Samples))
 	for k, v := range current.Samples {
-		copyCurrent.Samples[k] = v
+		copyCurrent.Samples[k] = v.deepCopy()
 	}
 	current.RUnlock()