diff --git a/src/gl/textures/gl_hwtexture.cpp b/src/gl/textures/gl_hwtexture.cpp
index 73c4e7b36..25dc989e7 100644
--- a/src/gl/textures/gl_hwtexture.cpp
+++ b/src/gl/textures/gl_hwtexture.cpp
@@ -64,18 +64,6 @@ extern int TexFormat[];
 //===========================================================================
 unsigned int FHardwareTexture::lastbound[FHardwareTexture::MAX_TEXTURES];
 
-//===========================================================================
-// 
-// STATIC - Gets the maximum size of hardware textures
-//
-//===========================================================================
-int FHardwareTexture::GetTexDimension(int value)
-{
-	if (value > gl.max_texturesize) return gl.max_texturesize;
-	return value;
-}
-
-
 //===========================================================================
 // 
 //	Quick'n dirty image rescaling.
diff --git a/src/gl/textures/gl_hwtexture.h b/src/gl/textures/gl_hwtexture.h
index 4c00af272..96eff0264 100644
--- a/src/gl/textures/gl_hwtexture.h
+++ b/src/gl/textures/gl_hwtexture.h
@@ -10,6 +10,7 @@
 #define DIRECT_PALETTE -2
 
 #include "tarray.h"
+#include "gl/system/gl_interface.h"
 
 class FCanvasTexture;
 class AActor;
@@ -49,7 +50,11 @@ public:
 
 	static unsigned int lastbound[MAX_TEXTURES];
 
-	static int GetTexDimension(int value);
+	static int GetTexDimension(int value)
+	{
+		if (value > gl.max_texturesize) return gl.max_texturesize;
+		return value;
+	}
 
 	static void InitGlobalState() { for (int i = 0; i < MAX_TEXTURES; i++) lastbound[i] = 0; }