diff --git a/src/hardware/hw_drv.h b/src/hardware/hw_drv.h
index e0c2f3273..7672f47c2 100644
--- a/src/hardware/hw_drv.h
+++ b/src/hardware/hw_drv.h
@@ -66,7 +66,7 @@ EXPORT void HWRAPI(SetSpecialState) (hwdspecialstate_t IdState, INT32 Value);
 
 //Hurdler: added for new development
 EXPORT void HWRAPI(DrawMD2) (INT32 *gl_cmd_buffer, md2_frame_t *frame, FTransform *pos, float scale);
-EXPORT void HWRAPI(DrawMD2i) (INT32 *gl_cmd_buffer, md2_frame_t *frame, UINT32 duration, UINT32 tics, md2_frame_t *nextframe, FTransform *pos, float scale, UINT8 flipped, UINT8 *color);
+EXPORT void HWRAPI(DrawMD2i) (INT32 *gl_cmd_buffer, md2_frame_t *frame, INT32 duration, INT32 tics, md2_frame_t *nextframe, FTransform *pos, float scale, UINT8 flipped, UINT8 *color);
 EXPORT void HWRAPI(SetTransform) (FTransform *ptransform);
 EXPORT INT32 HWRAPI(GetTextureUsed) (void);
 EXPORT INT32 HWRAPI(GetRenderVersion) (void);
diff --git a/src/hardware/hw_md2.c b/src/hardware/hw_md2.c
index 4ec2e346a..f59c1d4fc 100644
--- a/src/hardware/hw_md2.c
+++ b/src/hardware/hw_md2.c
@@ -1252,8 +1252,8 @@ void HWR_DrawMD2(gr_vissprite_t *spr)
 	{
 		GLPatch_t *gpatch;
 		INT32 *buff;
-		UINT32 durs = spr->mobj->state->tics;
-		UINT32 tics = spr->mobj->tics;
+		INT32 durs = spr->mobj->state->tics;
+		INT32 tics = spr->mobj->tics;
 		md2_frame_t *curr, *next = NULL;
 		const UINT8 flip = (UINT8)((spr->mobj->eflags & MFE_VERTICALFLIP) == MFE_VERTICALFLIP);
 		spritedef_t *sprdef;
diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index e672da8dc..205b399b8 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -1989,7 +1989,7 @@ static  void DrawMD2Ex(INT32 *gl_cmd_buffer, md2_frame_t *frame, INT32 duration,
 // -----------------+
 // HWRAPI DrawMD2   : Draw an MD2 model with glcommands
 // -----------------+
-EXPORT void HWRAPI(DrawMD2i) (INT32 *gl_cmd_buffer, md2_frame_t *frame, UINT32 duration, UINT32 tics, md2_frame_t *nextframe, FTransform *pos, float scale, UINT8 flipped, UINT8 *color)
+EXPORT void HWRAPI(DrawMD2i) (INT32 *gl_cmd_buffer, md2_frame_t *frame, INT32 duration, INT32 tics, md2_frame_t *nextframe, FTransform *pos, float scale, UINT8 flipped, UINT8 *color)
 {
 	DrawMD2Ex(gl_cmd_buffer, frame, duration, tics,  nextframe, pos, scale, flipped, color);
 }