diff --git a/prog/weavedns/main.go b/prog/weavedns/main.go
index 7f8334b0..0c843b43 100644
--- a/prog/weavedns/main.go
+++ b/prog/weavedns/main.go
@@ -103,7 +103,7 @@ func main() {
 
 	dockerCli, err = docker.NewClient(apiPath)
 	if err != nil {
-		Error.Fatal("[main] Unable to start docker client", err)
+		Error.Fatal("[main] Unable to start docker client: ", err)
 	}
 
 	if watch {
diff --git a/prog/weaver/main.go b/prog/weaver/main.go
index 984becb7..1c4de362 100644
--- a/prog/weaver/main.go
+++ b/prog/weaver/main.go
@@ -225,7 +225,7 @@ func createAllocator(router *weave.Router, apiPath string, ipRangeStr string, de
 
 	dockerCli, err := docker.NewClient(apiPath)
 	if err != nil {
-		Error.Fatal("Unable to start docker client", err)
+		Error.Fatal("Unable to start docker client: ", err)
 	}
 	if err = dockerCli.AddObserver(allocator); err != nil {
 		Error.Fatal("Unable to start watcher", err)