diff --git a/src/main/java/net/minecraft/server/BlockMushroom.java b/src/main/java/net/minecraft/server/BlockMushroom.java
index bfc48d4993..38fac4cfb4 100644
--- a/src/main/java/net/minecraft/server/BlockMushroom.java
+++ b/src/main/java/net/minecraft/server/BlockMushroom.java
@@ -48,6 +48,12 @@ public class BlockMushroom extends BlockFlower {
             j1 = j + random.nextInt(2) - random.nextInt(2);
             k1 = k + random.nextInt(3) - 1;
 
+            // CraftBukkit start - preserve source block coordinates
+            int sourceX = i;
+            int sourceY = j;
+            int sourceZ = k;
+            // CraftBukkit end
+
             for (int l1 = 0; l1 < 4; ++l1) {
                 if (world.isEmpty(i1, j1, k1) && this.d(world, i1, j1, k1)) {
                     i = i1;
@@ -66,7 +72,7 @@ public class BlockMushroom extends BlockFlower {
                 BlockState blockState = bworld.getBlockAt(i1, j1, k1).getState();
                 blockState.setTypeId(this.id);
 
-                BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(i, j, k), blockState);
+                BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(sourceX, sourceY, sourceZ), blockState);
                 world.getServer().getPluginManager().callEvent(event);
 
                 if (!event.isCancelled()) {