diff --git a/src/main/java/dk/camelot64/kickc/passes/Pass4ZeroPageCoalesceCallGraph.java b/src/main/java/dk/camelot64/kickc/passes/Pass4ZeroPageCoalesceCallGraph.java
index 904bf3af4..df277710a 100644
--- a/src/main/java/dk/camelot64/kickc/passes/Pass4ZeroPageCoalesceCallGraph.java
+++ b/src/main/java/dk/camelot64/kickc/passes/Pass4ZeroPageCoalesceCallGraph.java
@@ -11,10 +11,10 @@ import java.util.*;
 
 /**
  * Use the call graph to coalesce zero page registers.
- * For all variables:
+ * For each live range equivalence class:
  *  - Look up through the call graph and avoid all variables declared in the scopes there
- *  - Go through the zero pages from low to high and try to coalesce with the lowest possible one.
- *
+ *  - Go through already handled live range equivalence classes and if any exist with no scope overlap with the call graph - try to coalesce
+ *  - Add to the list of already handled live range equivalence classes
  */
 public class Pass4ZeroPageCoalesceCallGraph extends Pass2Base {
 
diff --git a/src/test/kc/examples/sinsprites/sinus-sprites.kc b/src/test/kc/examples/sinsprites/sinus-sprites.kc
index a81055760..dbbb3405b 100644
--- a/src/test/kc/examples/sinsprites/sinus-sprites.kc
+++ b/src/test/kc/examples/sinsprites/sinus-sprites.kc
@@ -172,6 +172,9 @@ void gen_chargen_sprite(byte ch, byte* sprite) {
     asm { cli }
 }
 
+// Reserve zeropage addresses used by the BASIC FP operations
+#reserve(0x07, 0x0d, 0x0e, 0x12)
+
 // Generate a sinus table using BASIC floats
 // - sintab is a pointer to the table to fill
 // - length is the length of the sine table