diff --git a/storage/metric/operation_test.go b/storage/metric/operation_test.go
index a648689c9..1e503499e 100644
--- a/storage/metric/operation_test.go
+++ b/storage/metric/operation_test.go
@@ -1271,7 +1271,7 @@ func TestGetValuesAtTimeOp(t *testing.T) {
 		}
 		for j, out := range scenario.out {
 			if out != actual[j] {
-				t.Fatal("%d. expected output %v, got %v", i, scenario.out, actual)
+				t.Fatalf("%d. expected output %v, got %v", i, scenario.out, actual)
 			}
 		}
 	}
@@ -1472,7 +1472,7 @@ func TestGetValuesAtIntervalOp(t *testing.T) {
 		}
 		for j, out := range scenario.out {
 			if out != actual[j] {
-				t.Fatal("%d. expected output %v, got %v", i, scenario.out, actual)
+				t.Fatalf("%d. expected output %v, got %v", i, scenario.out, actual)
 			}
 		}
 	}
@@ -1648,7 +1648,7 @@ func TestGetValuesAlongRangeOp(t *testing.T) {
 		}
 		for j, out := range scenario.out {
 			if out != actual[j] {
-				t.Fatal("%d. expected output %v, got %v", i, scenario.out, actual)
+				t.Fatalf("%d. expected output %v, got %v", i, scenario.out, actual)
 			}
 		}
 	}
diff --git a/storage/metric/stochastic_test.go b/storage/metric/stochastic_test.go
index 2d41d06f7..d5216ad26 100644
--- a/storage/metric/stochastic_test.go
+++ b/storage/metric/stochastic_test.go
@@ -156,7 +156,7 @@ func AppendSampleAsSparseAppendWithReadsTests(p MetricPersistence, t test.Tester
 			return
 		}
 		if len(fingerprints) != 1 {
-			t.Error("expected fingerprint count of %d, got %d", 1, len(fingerprints))
+			t.Errorf("expected fingerprint count of %d, got %d", 1, len(fingerprints))
 			return
 		}