diff --git a/eth/gasprice/feehistory_test.go b/eth/gasprice/feehistory_test.go
index f3344348c2..7fc77d57ed 100644
--- a/eth/gasprice/feehistory_test.go
+++ b/eth/gasprice/feehistory_test.go
@@ -83,6 +83,11 @@ func TestFeeHistory(t *testing.T) {
 		if len(ratio) != c.expCount {
 			t.Fatalf("Test case %d: gasUsedRatio array length mismatch, want %d, got %d", i, c.expCount, len(ratio))
 		}
+		for _, ratio := range ratio {
+			if ratio > 1 {
+				t.Fatalf("Test case %d: gasUsedRatio greater than 1, got %f", i, ratio)
+			}
+		}
 		if err != c.expErr && !errors.Is(err, c.expErr) {
 			t.Fatalf("Test case %d: error mismatch, want %v, got %v", i, c.expErr, err)
 		}