diff --git a/Algebra Cheat Sheet.rtf b/Algebra Cheat Sheet.rtf
index c8989cd1..ecc15e26 100644
Binary files a/Algebra Cheat Sheet.rtf and b/Algebra Cheat Sheet.rtf differ
diff --git a/math-rules-cache.zip b/math-rules-cache.zip
index 15cb0ecb..1428591c 100644
Binary files a/math-rules-cache.zip and b/math-rules-cache.zip differ
diff --git a/src/main/java/org/warp/picalculator/math/rules/RulesManager.java b/src/main/java/org/warp/picalculator/math/rules/RulesManager.java
index 0e067cd5..85d14802 100644
--- a/src/main/java/org/warp/picalculator/math/rules/RulesManager.java
+++ b/src/main/java/org/warp/picalculator/math/rules/RulesManager.java
@@ -107,6 +107,9 @@ public class RulesManager {
 			}
 			Utils.out.println(Utils.OUTPUTLEVEL_NODEBUG, "RulesManager", "Loaded all the rules successfully");
 			if (compiledSomething) {
+				if (cacheFilePath.toFile().exists()) {
+					cacheFilePath.toFile().delete();
+				}
 				Utils.zip(tDir.toString(), cacheFilePath.toString(), "");
 				Utils.out.println(Utils.OUTPUTLEVEL_NODEBUG, "RulesManager", "Cached the compiled rules");
 			}