diff --git a/src/bin/ponderosa-asm.rs b/src/bin/ponderosa-asm.rs
index b97d4f8..66a43c4 100644
--- a/src/bin/ponderosa-asm.rs
+++ b/src/bin/ponderosa-asm.rs
@@ -89,11 +89,12 @@ fn parse_forestry_op(tokens: &Vec<&str>, opcode: u16) -> Result<u16, String> {
         Err(format!("Cannot reach cell at {relative_y} along the Y-axis; trees may only access cells in the range of -16 to 15"))
     } else {
         Ok(
-            opcode<<11
-            | stack<<10
-            | ((relative_x as u16)<<5) & 0b11111
-            | (relative_y as u16) & 0b11111
+            (opcode<<11)
+            | (stack<<10)
+            | (((relative_x as u16) & 0b11111)<<5)
+            | ((relative_y as u16) & 0b11111)
         )
+
     }
 }