diff --git a/src/mame/namco/namcos22_v.cpp b/src/mame/namco/namcos22_v.cpp
index 5c463a1d44f..1173b6681b3 100644
--- a/src/mame/namco/namcos22_v.cpp
+++ b/src/mame/namco/namcos22_v.cpp
@@ -81,9 +81,9 @@ void namcos22_renderer::renderscanline_poly(int32_t scanline, const extent_t &ex
 		// texture mapping
 		if (texture_enabled)
 		{
-			int tx = u * ooz;
-			int ty = v * ooz + bn;
-			int to = ((ty & 0xfff0) << 4) | ((tx & 0xff0) >> 4);
+			int tx = int(u * ooz) & 0xfff;
+			int ty = (int(v * ooz) & 0xfff) | bn;
+			int to = (ty << 4 & 0xfff00) | (tx >> 4);
 			pen = ttdata[(ttmap[to] << 8) | tt_ayx_to_pixel[ttattr[to] << 8 | (ty << 4 & 0xf0) | (tx & 0xf)]];
 			rgb.set(pens[pen >> penshift & penmask]);
 		}
@@ -174,9 +174,9 @@ void namcos22_renderer::renderscanline_poly_ss22(int32_t scanline, const extent_
 		// texture mapping
 		if (texture_enabled)
 		{
-			int tx = u * ooz;
-			int ty = v * ooz + bn;
-			int to = ((ty & 0xfff0) << 4) | ((tx & 0xff0) >> 4);
+			int tx = int(u * ooz) & 0xfff;
+			int ty = (int(v * ooz) & 0xfff) | bn;
+			int to = (ty << 4 & 0xfff00) | (tx >> 4);
 			pen = ttdata[(ttmap[to] << 8) | tt_ayx_to_pixel[ttattr[to] << 8 | (ty << 4 & 0xf0) | (tx & 0xf)]];
 			rgb.set(pens[pen >> penshift & penmask]);
 		}