diff --git a/cache_test.go b/cache_test.go
index e25faf0..57db9e0 100644
--- a/cache_test.go
+++ b/cache_test.go
@@ -417,12 +417,12 @@ func TestIncrementOverflowInt(t *testing.T) {
 	tc.Set("int8", int8(127), 0)
 	err := tc.Increment("int8", 1)
 	if err != nil {
-		t.Error("Error incrementing int8: %s", err)
+		t.Error("Error incrementing int8:", err)
 	}
 	x, _ := tc.Get("int8")
 	int8 := x.(int8)
 	if int8 != -128 {
-		t.Error("int8 did not overflow as expected; value: %d", int8)
+		t.Error("int8 did not overflow as expected; value:", int8)
 	}
 
 }
@@ -432,12 +432,12 @@ func TestIncrementOverflowUint(t *testing.T) {
 	tc.Set("uint8", uint8(255), 0)
 	err := tc.Increment("uint8", 1)
 	if err != nil {
-		t.Error("Error incrementing int8: %s", err)
+		t.Error("Error incrementing int8:", err)
 	}
 	x, _ := tc.Get("uint8")
 	uint8 := x.(uint8)
 	if uint8 != 0 {
-		t.Error("uint8 did not overflow as expected; value: %d", uint8)
+		t.Error("uint8 did not overflow as expected; value:", uint8)
 	}
 }
 
@@ -446,12 +446,12 @@ func TestDecrementUnderflowUint(t *testing.T) {
 	tc.Set("uint8", uint8(0), 0)
 	err := tc.Decrement("uint8", 1)
 	if err != nil {
-		t.Error("Error decrementing int8: %s", err)
+		t.Error("Error decrementing int8:", err)
 	}
 	x, _ := tc.Get("uint8")
 	uint8 := x.(uint8)
 	if uint8 != 255 {
-		t.Error("uint8 did not underflow as expected; value: %d", uint8)
+		t.Error("uint8 did not underflow as expected; value:", uint8)
 	}
 }