diff --git a/.travis.yml b/.travis.yml
index 545f4147..d24ce2b2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: go
 go:
-- 1.9
+- "1.9"
+- "1.10"
+- "1.11"
 install:
 - make get-deps
 script:
diff --git a/template_test.go b/template_test.go
index dd1d58c3..71501ada 100644
--- a/template_test.go
+++ b/template_test.go
@@ -71,7 +71,7 @@ func TestKeysEmpty(t *testing.T) {
 	}
 
 	if len(input) != vk.Len() {
-		t.Fatalf("Incorrect key count; expected %s, got %s", len(input), vk.Len())
+		t.Fatalf("Incorrect key count; expected %d, got %d", len(input), vk.Len())
 	}
 }
 
@@ -269,11 +269,11 @@ func TestGroupByMulti(t *testing.T) {
 	}
 
 	if len(groups["demo1.localhost"]) != 2 {
-		t.Fatalf("expected 2 got %s", len(groups["demo1.localhost"]))
+		t.Fatalf("expected 2 got %d", len(groups["demo1.localhost"]))
 	}
 
 	if len(groups["demo2.localhost"]) != 1 {
-		t.Fatalf("expected 1 got %s", len(groups["demo2.localhost"]))
+		t.Fatalf("expected 1 got %d", len(groups["demo2.localhost"]))
 	}
 	if groups["demo2.localhost"][0].(RuntimeContainer).ID != "3" {
 		t.Fatalf("expected 2 got %s", groups["demo2.localhost"][0].(RuntimeContainer).ID)
@@ -785,7 +785,7 @@ func TestJson(t *testing.T) {
 		t.Fatal(err)
 	}
 	if len(decoded) != len(containers) {
-		t.Fatal("Incorrect unmarshaled container count. Expected %d, got %d.", len(containers), len(decoded))
+		t.Fatalf("Incorrect unmarshaled container count. Expected %d, got %d.", len(containers), len(decoded))
 	}
 }
 
diff --git a/utils_test.go b/utils_test.go
index 45186ac3..c5a8c17b 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -30,7 +30,7 @@ func TestDockerHostEndpoint(t *testing.T) {
 
 	endpoint, err := GetEndpoint("")
 	if err != nil {
-		t.Fatal("%s", err)
+		t.Fatalf("%s", err)
 	}
 
 	if endpoint != "tcp://127.0.0.1:4243" {
@@ -48,7 +48,7 @@ func TestDockerFlagEndpoint(t *testing.T) {
 	// flag value should override DOCKER_HOST and default value
 	endpoint, err := GetEndpoint("tcp://127.0.0.1:5555")
 	if err != nil {
-		t.Fatal("%s", err)
+		t.Fatalf("%s", err)
 	}
 	if endpoint != "tcp://127.0.0.1:5555" {
 		t.Fatalf("Expected tcp://127.0.0.1:5555, got %s", endpoint)