diff --git a/src/libprojectM/Renderer/Renderer.cpp b/src/libprojectM/Renderer/Renderer.cpp
index de6e4b0db..78d1fc6c9 100644
--- a/src/libprojectM/Renderer/Renderer.cpp
+++ b/src/libprojectM/Renderer/Renderer.cpp
@@ -441,8 +441,8 @@ void Renderer::reset(int w, int h)
     texsizeY = h;
 
     // snap to 16x16 blocks
-    texsizeX = ((texsizeX+15)/16)*16;
-    texsizeY = ((texsizeY+15)/16)*16;
+    texsizeX = ((texsizeX-15)/16)*16;
+    texsizeY = ((texsizeY-15)/16)*16;
 
     m_fAspectX = (texsizeY > texsizeX) ? (float)texsizeX/(float)texsizeY : 1.0f;
     m_fAspectY = (texsizeX > texsizeY) ? (float)texsizeY/(float)texsizeX : 1.0f;