diff --git a/common/main/fwd-object.h b/common/main/fwd-object.h
index 11fab8aed..dc49621ac 100644
--- a/common/main/fwd-object.h
+++ b/common/main/fwd-object.h
@@ -204,7 +204,7 @@ extern int Death_sequence_aborted;
 extern objnum_t Player_fired_laser_this_frame;
 
 // Draw a blob-type object, like a fireball
-void draw_object_blob(const object_base &obj, bitmap_index bitmap);
+void draw_object_blob(grs_canvas &, const object_base &obj, bitmap_index bitmap);
 }
 
 #ifdef dsx
diff --git a/similar/main/laser.cpp b/similar/main/laser.cpp
index 5f0447edd..fa48148c9 100644
--- a/similar/main/laser.cpp
+++ b/similar/main/laser.cpp
@@ -94,7 +94,7 @@ void Laser_render(const object_base &obj)
 					//Laser_draw_one(obj-Objects, Weapon_info[obj->id].bitmap );
 		break;
 	case WEAPON_RENDER_BLOB:
-		draw_object_blob(obj, wi.bitmap);
+		draw_object_blob(*grd_curcanv, obj, wi.bitmap);
 		break;
 	case WEAPON_RENDER_POLYMODEL:
 		break;
diff --git a/similar/main/object.cpp b/similar/main/object.cpp
index 76e3f2189..b4209ca39 100644
--- a/similar/main/object.cpp
+++ b/similar/main/object.cpp
@@ -151,7 +151,7 @@ objptridx_t obj_find_first_of_type(int type)
 namespace dcx {
 
 //draw an object that has one bitmap & doesn't rotate
-void draw_object_blob(const object_base &obj, bitmap_index bmi)
+void draw_object_blob(grs_canvas &canvas, const object_base &obj, const bitmap_index bmi)
 {
 	auto &bm = GameBitmaps[bmi.index];
 	PIGGY_PAGE_IN( bmi );
@@ -172,7 +172,7 @@ void draw_object_blob(const object_base &obj, bitmap_index bmi)
 	const auto p = (bm_w > bm_h)
 		? wh(osize, fixmuldiv(osize, bm_h, bm_w))
 		: wh(fixmuldiv(osize, bm_w, bm_h), osize);
-	g3_draw_bitmap(*grd_curcanv, pos, p.first, p.second, bm);
+	g3_draw_bitmap(canvas, pos, p.first, p.second, bm);
 }
 
 }
diff --git a/similar/main/powerup.cpp b/similar/main/powerup.cpp
index f54ffb863..40f5012fa 100644
--- a/similar/main/powerup.cpp
+++ b/similar/main/powerup.cpp
@@ -121,7 +121,7 @@ namespace dcx {
 void draw_powerup(const object_base &obj)
 {
 	auto &vci = obj.rtype.vclip_info;
-	draw_object_blob(obj, Vclip[vci.vclip_num].frames[vci.framenum]);
+	draw_object_blob(*grd_curcanv, obj, Vclip[vci.vclip_num].frames[vci.framenum]);
 }
 
 }
diff --git a/similar/main/vclip.cpp b/similar/main/vclip.cpp
index 2edfe9f3b..7ebb9b5ed 100644
--- a/similar/main/vclip.cpp
+++ b/similar/main/vclip.cpp
@@ -63,11 +63,9 @@ void draw_vclip_object(const vobjptridx_t obj,fix timeleft,int lighted, int vcli
 			draw_object_tmap_rod(*grd_curcanv, obj, Vclip[vclip_num].frames[bitmapnum],lighted);
 		else {
 			Assert(lighted==0);		//blob cannot now be lighted
-
-			draw_object_blob(obj, Vclip[vclip_num].frames[bitmapnum] );
+			draw_object_blob(*grd_curcanv, obj, Vclip[vclip_num].frames[bitmapnum] );
 		}
 	}
-
 }