diff --git a/src/SFML.Audio/Music.cs b/src/SFML.Audio/Music.cs
index 3636f7c2..cdf9984b 100644
--- a/src/SFML.Audio/Music.cs
+++ b/src/SFML.Audio/Music.cs
@@ -390,7 +390,7 @@ public TimeSpan(Time offset, Time length)
         private unsafe static extern IntPtr sfMusic_createFromStream(IntPtr stream);
 
         [DllImport(CSFML.audio, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
-        private static extern IntPtr sfMusic_createFromMemory(IntPtr data, ulong size);
+        private static extern IntPtr sfMusic_createFromMemory(IntPtr data, uint size);
 
         [DllImport(CSFML.audio, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
         private static extern void sfMusic_destroy(IntPtr MusicStream);
diff --git a/src/SFML.Audio/SoundBuffer.cs b/src/SFML.Audio/SoundBuffer.cs
index 4e743172..3577f8e6 100644
--- a/src/SFML.Audio/SoundBuffer.cs
+++ b/src/SFML.Audio/SoundBuffer.cs
@@ -224,7 +224,7 @@ protected override void Destroy(bool disposing)
         private unsafe static extern IntPtr sfSoundBuffer_createFromStream(IntPtr stream);
 
         [DllImport(CSFML.audio, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
-        private unsafe static extern IntPtr sfSoundBuffer_createFromMemory(IntPtr data, ulong size);
+        private unsafe static extern IntPtr sfSoundBuffer_createFromMemory(IntPtr data, uint size);
 
         [DllImport(CSFML.audio, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
         private unsafe static extern IntPtr sfSoundBuffer_createFromSamples(short* Samples, ulong SampleCount, uint ChannelsCount, uint SampleRate);
diff --git a/src/SFML.Graphics/Font.cs b/src/SFML.Graphics/Font.cs
index 36112348..cdddd04b 100644
--- a/src/SFML.Graphics/Font.cs
+++ b/src/SFML.Graphics/Font.cs
@@ -230,7 +230,7 @@ internal struct InfoMarshalData
         private static extern IntPtr sfFont_createFromStream(IntPtr stream);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
-        private static extern IntPtr sfFont_createFromMemory(IntPtr data, ulong size);
+        private static extern IntPtr sfFont_createFromMemory(IntPtr data, uint size);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
         private static extern IntPtr sfFont_copy(IntPtr Font);
diff --git a/src/SFML.Graphics/Image.cs b/src/SFML.Graphics/Image.cs
index 155bf6a9..485e9eb3 100644
--- a/src/SFML.Graphics/Image.cs
+++ b/src/SFML.Graphics/Image.cs
@@ -365,7 +365,7 @@ protected override void Destroy(bool disposing)
         private unsafe static extern IntPtr sfImage_createFromStream(IntPtr stream);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
-        private unsafe static extern IntPtr sfImage_createFromMemory(IntPtr data, ulong size);
+        private unsafe static extern IntPtr sfImage_createFromMemory(IntPtr data, uint size);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
         private static extern IntPtr sfImage_copy(IntPtr Image);
diff --git a/src/SFML.Graphics/Texture.cs b/src/SFML.Graphics/Texture.cs
index b8e904e2..d3a1bab5 100644
--- a/src/SFML.Graphics/Texture.cs
+++ b/src/SFML.Graphics/Texture.cs
@@ -493,7 +493,7 @@ protected override void Destroy(bool disposing)
         private static extern IntPtr sfTexture_createFromImage(IntPtr image, ref IntRect area);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
-        private static extern IntPtr sfTexture_createFromMemory(IntPtr data, ulong size, ref IntRect area);
+        private static extern IntPtr sfTexture_createFromMemory(IntPtr data, uint size, ref IntRect area);
 
         [DllImport(CSFML.graphics, CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
         private static extern IntPtr sfTexture_copy(IntPtr texture);