diff --git a/similar/arch/ogl/gr.cpp b/similar/arch/ogl/gr.cpp
index 21b10d18b..1a31e56f0 100644
--- a/similar/arch/ogl/gr.cpp
+++ b/similar/arch/ogl/gr.cpp
@@ -934,8 +934,8 @@ void ogl_ulinec(int left,int top,int right,int bot,int c)
 	glEnableClientState(GL_VERTEX_ARRAY);
 	glEnableClientState(GL_COLOR_ARRAY);
 	
-	xo = (left + grd_curcanv->cv_bitmap.bm_x + 0.5) / (float)last_width;
-	xf = (right + grd_curcanv->cv_bitmap.bm_x + 0.5) / (float)last_width;
+	xo = (left + grd_curcanv->cv_bitmap.bm_x) / (float)last_width;
+	xf = (right + grd_curcanv->cv_bitmap.bm_x) / (float)last_width;
 	yo = 1.0 - (top + grd_curcanv->cv_bitmap.bm_y + 0.5) / (float)last_height;
 	yf = 1.0 - (bot + grd_curcanv->cv_bitmap.bm_y + 0.5) / (float)last_height;
  
diff --git a/similar/main/gauges.cpp b/similar/main/gauges.cpp
index 3aa490f8a..f1e6b2577 100644
--- a/similar/main/gauges.cpp
+++ b/similar/main/gauges.cpp
@@ -2393,10 +2393,10 @@ static void sb_draw_afterburner(const local_multires_gauge_graphic multires_gaug
 	hud_gauge_bitblt(SB_AFTERBURNER_GAUGE_X, SB_AFTERBURNER_GAUGE_Y, SB_GAUGE_AFTERBURNER, multires_gauge_graphic);
 
 	const auto color = 0;
-	const int erase_x0 = i2f(HUD_SCALE_X(SB_AFTERBURNER_GAUGE_X - 1));
+	const int erase_x0 = i2f(HUD_SCALE_X(SB_AFTERBURNER_GAUGE_X));
 	const int erase_x1 = i2f(HUD_SCALE_X(SB_AFTERBURNER_GAUGE_X + (SB_AFTERBURNER_GAUGE_W)));
 	const int erase_y_base = HUD_SCALE_Y(SB_AFTERBURNER_GAUGE_Y);
-	for (int i = HUD_SCALE_Y(fixmul((f1_0 - Afterburner_charge), SB_AFTERBURNER_GAUGE_H - 1)); i-- > 0;)
+	for (int i = HUD_SCALE_Y(fixmul((f1_0 - Afterburner_charge), SB_AFTERBURNER_GAUGE_H)); i-- > 0;)
 	{
 		const int erase_y = i2f(erase_y_base + i);
 		gr_uline(erase_x0, erase_y, erase_x1, erase_y, color);