diff --git a/SDL3-CS.Tests/TestError.cs b/SDL3-CS.Tests/TestError.cs
new file mode 100644
index 0000000..c33b1d1
--- /dev/null
+++ b/SDL3-CS.Tests/TestError.cs
@@ -0,0 +1,25 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+
+namespace SDL.Tests
+{
+    [TestFixture]
+    public class TestError
+    {
+        [Test]
+        public void TestUnsupported()
+        {
+            Assert.That((bool)SDL3.SDL_Unsupported(), Is.False);
+            Assert.That(SDL3.SDL_GetError(), Is.EqualTo("That operation is not supported"));
+        }
+
+        [Test]
+        public void TestInvalidParam()
+        {
+            Assert.That((bool)SDL3.SDL_InvalidParamError("test"), Is.False);
+            Assert.That(SDL3.SDL_GetError(), Is.EqualTo("Parameter 'test' is invalid"));
+        }
+    }
+}
diff --git a/SDL3-CS/SDL3/SDL_error.cs b/SDL3-CS/SDL3/SDL_error.cs
index 749bbbc..82891aa 100644
--- a/SDL3-CS/SDL3/SDL_error.cs
+++ b/SDL3-CS/SDL3/SDL_error.cs
@@ -8,14 +8,14 @@ namespace SDL
         [Macro]
         public static unsafe SDLBool SDL_Unsupported()
         {
-            fixed (byte* fmt = "That operation is not supported"u8)
+            fixed (byte* fmt = "That operation is not supported\0"u8)
                 return SDL_SetError(fmt, __arglist());
         }
 
         [Macro]
         public static unsafe SDLBool SDL_InvalidParamError([NativeTypeName("const char *")] byte* param)
         {
-            fixed (byte* fmt = "Parameter '%s' is invalid"u8)
+            fixed (byte* fmt = "Parameter '%s' is invalid\0"u8)
                 return SDL_SetError(fmt, __arglist(param));
         }
     }