diff --git a/src/common/textures/formats/rawpagetexture.cpp b/src/common/textures/formats/rawpagetexture.cpp
index 271f22d4a3b..19d3f458785 100644
--- a/src/common/textures/formats/rawpagetexture.cpp
+++ b/src/common/textures/formats/rawpagetexture.cpp
@@ -62,7 +62,7 @@ class FRawPageTexture : public FImageSource
 //
 //==========================================================================
 
-bool CheckIfRaw(FileReader & data, int desiredsize)
+bool CheckIfRaw(FileReader & data, unsigned desiredsize)
 {
 	if (data.GetLength() != desiredsize) return false;
 
diff --git a/src/common/textures/formats/startuptexture.cpp b/src/common/textures/formats/startuptexture.cpp
index 66672677418..8a2a1e602f8 100644
--- a/src/common/textures/formats/startuptexture.cpp
+++ b/src/common/textures/formats/startuptexture.cpp
@@ -109,7 +109,7 @@ class FStrifeStartupBackground : public FImageSource
 //
 //==========================================================================
 
-bool CheckIfRaw(FileReader & data, int desiredsize);
+bool CheckIfRaw(FileReader & data, unsigned desiredsize);
 
 //==========================================================================
 //