diff --git a/bsnes/sfc/ppu-fast/background.cpp b/bsnes/sfc/ppu-fast/background.cpp
index cb880bd6..ffa6867c 100644
--- a/bsnes/sfc/ppu-fast/background.cpp
+++ b/bsnes/sfc/ppu-fast/background.cpp
@@ -33,7 +33,7 @@ auto PPU::Line::renderBackground(PPU::IO::Background& self, uint8 source) -> voi
     hscroll <<= 1;
     if(io.interlace) {
       y = y << 1 | field();
-      if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter + ppu.field();
+      if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter + field();
     }
   }
 
diff --git a/bsnes/sfc/ppu-fast/io.cpp b/bsnes/sfc/ppu-fast/io.cpp
index 7447be79..4e445a03 100644
--- a/bsnes/sfc/ppu-fast/io.cpp
+++ b/bsnes/sfc/ppu-fast/io.cpp
@@ -248,14 +248,13 @@ auto PPU::writeIO(uint address, uint8 data) -> void {
   }
 
   case 0x2106: {  //MOSAIC
-    bool enable = io.bg1.mosaicEnable || io.bg2.mosaicEnable || io.bg3.mosaicEnable || io.bg4.mosaicEnable;
+    bool mosaicEnable = io.bg1.mosaicEnable || io.bg2.mosaicEnable || io.bg3.mosaicEnable || io.bg4.mosaicEnable;
     io.bg1.mosaicEnable = data >> 0 & 1;
     io.bg2.mosaicEnable = data >> 1 & 1;
     io.bg3.mosaicEnable = data >> 2 & 1;
     io.bg4.mosaicEnable = data >> 3 & 1;
-    io.mosaic.enable    = data >> 0 & 15;
     io.mosaic.size      = (data >> 4 & 15) + 1;
-    if(!enable && (data >> 0 & 15)) {
+    if(!mosaicEnable && (data >> 0 & 15)) {
       //mosaic vcounter is reloaded when mosaic becomes enabled
       io.mosaic.counter = io.mosaic.size + 1;
     }
diff --git a/bsnes/sfc/ppu-fast/line.cpp b/bsnes/sfc/ppu-fast/line.cpp
index f14a9899..7edf7e18 100644
--- a/bsnes/sfc/ppu-fast/line.cpp
+++ b/bsnes/sfc/ppu-fast/line.cpp
@@ -27,12 +27,6 @@ auto PPU::Line::flush() -> void {
 
 auto PPU::Line::cache() -> void {
   uint y = ppu.vcounter();
-  if(y == 1) {
-    ppu.io.mosaic.counter = ppu.io.mosaic.enable ? ppu.io.mosaic.size + 1 : 0;
-  }
-  if(ppu.io.mosaic.counter && !--ppu.io.mosaic.counter) {
-    ppu.io.mosaic.counter = ppu.io.mosaic.enable ? ppu.io.mosaic.size + 0 : 0;
-  }
   if(ppu.io.displayDisable || y >= ppu.vdisp()) {
     io.displayDisable = true;
   } else {
diff --git a/bsnes/sfc/ppu-fast/mode7.cpp b/bsnes/sfc/ppu-fast/mode7.cpp
index c5251c17..dc44accf 100644
--- a/bsnes/sfc/ppu-fast/mode7.cpp
+++ b/bsnes/sfc/ppu-fast/mode7.cpp
@@ -1,12 +1,12 @@
 auto PPU::Line::renderMode7(PPU::IO::Background& self, uint8 source) -> void {
   //HD mode 7 support
-  if(!ppu.hdMosaic() || !self.mosaicEnable || !io.mosaic.size) {
+  if(!ppu.hdMosaic() || !self.mosaicEnable || io.mosaic.size == 1) {
     if(ppu.hdScale() > 1) return renderMode7HD(self, source);
   }
 
   int Y = this->y;
+  if(self.mosaicEnable) Y -= io.mosaic.size - io.mosaic.counter;
   int y = !io.mode7.vflip ? Y : 255 - Y;
-  if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter;
 
   int a = (int16)io.mode7.a;
   int b = (int16)io.mode7.b;
diff --git a/bsnes/sfc/ppu-fast/ppu.cpp b/bsnes/sfc/ppu-fast/ppu.cpp
index 0ebb3450..718a6338 100644
--- a/bsnes/sfc/ppu-fast/ppu.cpp
+++ b/bsnes/sfc/ppu-fast/ppu.cpp
@@ -85,6 +85,13 @@ auto PPU::main() -> void {
     uint y = vcounter();
     if(y >= 1 && y <= 239) {
       step(renderCycle());
+      bool mosaicEnable = io.bg1.mosaicEnable || io.bg2.mosaicEnable || io.bg3.mosaicEnable || io.bg4.mosaicEnable;
+      if(y == 1) {
+        io.mosaic.counter = mosaicEnable ? io.mosaic.size + 1 : 0;
+      }
+      if(io.mosaic.counter && !--io.mosaic.counter) {
+        io.mosaic.counter = mosaicEnable ? io.mosaic.size + 0 : 0;
+      }
       lines[y].cache();
     }
   }
diff --git a/bsnes/sfc/ppu-fast/ppu.hpp b/bsnes/sfc/ppu-fast/ppu.hpp
index 61e8aea5..2ef93c42 100644
--- a/bsnes/sfc/ppu-fast/ppu.hpp
+++ b/bsnes/sfc/ppu-fast/ppu.hpp
@@ -102,7 +102,6 @@ public:
       //serialization.cpp
       auto serialize(serializer&) -> void;
 
-      uint8 enable = 0;
       uint8 size = 1;
       uint8 counter = 0;
     } mosaic;
diff --git a/bsnes/sfc/ppu-fast/serialization.cpp b/bsnes/sfc/ppu-fast/serialization.cpp
index 75248288..ff6b4171 100644
--- a/bsnes/sfc/ppu-fast/serialization.cpp
+++ b/bsnes/sfc/ppu-fast/serialization.cpp
@@ -69,7 +69,6 @@ auto PPU::IO::serialize(serializer& s) -> void {
 }
 
 auto PPU::IO::Mosaic::serialize(serializer& s) -> void {
-  s.integer(enable);
   s.integer(size);
   s.integer(counter);
 }
diff --git a/bsnes/sfc/ppu/io.cpp b/bsnes/sfc/ppu/io.cpp
index fa07c7bd..745b3331 100644
--- a/bsnes/sfc/ppu/io.cpp
+++ b/bsnes/sfc/ppu/io.cpp
@@ -262,15 +262,16 @@ auto PPU::writeIO(uint addr, uint8 data) -> void {
 
   //MOSAIC
   case 0x2106: {
-    if(!mosaic.enable() && (data >> 0 & 15)) {
-      //mosaic vcounter is reloaded when mosaic becomes enabled
-      mosaic.vcounter = (data >> 4 & 15) + 2;
-    }
+    bool mosaicEnable = mosaic.enable();
     bg1.mosaic.enable = data >> 0 & 1;
     bg2.mosaic.enable = data >> 1 & 1;
     bg3.mosaic.enable = data >> 2 & 1;
     bg4.mosaic.enable = data >> 3 & 1;
     mosaic.size       = (data >> 4 & 15) + 1;
+    if(!mosaicEnable && mosaic.enable()) {
+      //mosaic vcounter is reloaded when mosaic becomes enabled
+      mosaic.vcounter = mosaic.size + 1;
+    }
     return;
   }