diff --git a/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs b/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
index 6b4f19158a..409534c3bb 100644
--- a/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
+++ b/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
@@ -127,7 +127,7 @@ namespace OpenRA.Mods.Common.SpriteLoaders
 				if (png.EmbeddedData.ContainsKey("FrameAmount"))
 					frameAmount = FieldLoader.GetValue<int>("FrameAmount", png.EmbeddedData["FrameAmount"]);
 				else
-					frameAmount = png.Width / frameSize.Width * png.Height / frameSize.Height;
+					frameAmount = (png.Width / frameSize.Width) * (png.Height / frameSize.Height);
 			}
 			else if (png.EmbeddedData.ContainsKey("FrameAmount"))
 			{