diff --git a/osu.Game.Tests/Extensions/NumberFormattingExtensionsTest.cs b/osu.Game.Tests/Extensions/NumberFormattingExtensionsTest.cs
index b02bf01019..3a96459b73 100644
--- a/osu.Game.Tests/Extensions/NumberFormattingExtensionsTest.cs
+++ b/osu.Game.Tests/Extensions/NumberFormattingExtensionsTest.cs
@@ -46,9 +46,12 @@ namespace osu.Game.Tests.Extensions
 
         [Test]
         [SetCulture("fr-FR")]
-        public void TestCultureInsensitivity()
+        [TestCase(0.4, true, 2, ExpectedResult = "40%")]
+        [TestCase(1e-6, false, 6, ExpectedResult = "0.000001")]
+        [TestCase(0.48333, true, 4, ExpectedResult = "48.33%")]
+        public string TestCultureInsensitivity(double input, bool percent, int decimalDigits)
         {
-            Assert.That(0.4.ToStandardFormattedString(maxDecimalDigits: 2, asPercentage: true), Is.EqualTo("40%"));
+            return input.ToStandardFormattedString(decimalDigits, percent);
         }
     }
 }
diff --git a/osu.Game/Extensions/NumberFormattingExtensions.cs b/osu.Game/Extensions/NumberFormattingExtensions.cs
index 33252448fc..ff35dbc2a0 100644
--- a/osu.Game/Extensions/NumberFormattingExtensions.cs
+++ b/osu.Game/Extensions/NumberFormattingExtensions.cs
@@ -36,7 +36,7 @@ namespace osu.Game.Extensions
 
             string negativeSign = Math.Round(floatValue, significantDigits) < 0 ? "-" : string.Empty;
 
-            return FormattableString.Invariant($"{negativeSign}{Math.Abs(floatValue).ToString($"N{significantDigits}")}");
+            return $"{negativeSign}{Math.Abs(floatValue).ToString($"N{significantDigits}", CultureInfo.InvariantCulture)}";
         }
 
         /// <summary>
diff --git a/osu.Game/Rulesets/Mods/ModRateAdjust.cs b/osu.Game/Rulesets/Mods/ModRateAdjust.cs
index d5fc1363bb..49bdd93bc6 100644
--- a/osu.Game/Rulesets/Mods/ModRateAdjust.cs
+++ b/osu.Game/Rulesets/Mods/ModRateAdjust.cs
@@ -32,7 +32,7 @@ namespace osu.Game.Rulesets.Mods
             get
             {
                 if (!SpeedChange.IsDefault)
-                    yield return ("Speed change", $"{SpeedChange.Value:N2}x");
+                    yield return ("Speed change", FormattableString.Invariant($@"{SpeedChange.Value:N2}x"));
             }
         }