diff --git a/.gitignore b/.gitignore
index 391cee8d..49dd509d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,7 @@ docs/
 # Certora
 .certora**
 emv-*-certora*
+certora/munged
 
 # Dotenv file
 .env
diff --git a/certora/makefile b/certora/makefile
new file mode 100644
index 00000000..664ff4fb
--- /dev/null
+++ b/certora/makefile
@@ -0,0 +1,12 @@
+munged: $(wildcard ../src/*.sol) munging.patch
+	@rm -rf munged
+	@cp -r ../src munged
+	@patch -p0 -d munged < munging.patch
+
+record:
+	diff -ruN ../src munged | sed 's+\.\./src/++g' | sed 's+munged/++g' > munging.patch
+
+clean:
+	rm -rf munged
+
+.PHONY: record clean # do not add munged here, as it is useful to protect munged edits
diff --git a/certora/munging.patch b/certora/munging.patch
new file mode 100644
index 00000000..d3fd532a
--- /dev/null
+++ b/certora/munging.patch
@@ -0,0 +1,12 @@
+diff -ruN Irm.sol Irm.sol
+--- Irm.sol	2023-09-19 15:59:58.045886731 +0200
++++ Irm.sol	2023-09-19 16:09:50.491751975 +0200
+@@ -38,7 +38,7 @@
+     /// @notice Speed factor (scaled by WAD).
+     uint256 public immutable SPEED_FACTOR;
+     /// @notice Target utilization (scaled by WAD).
+-    uint256 public immutable TARGET_UTILIZATION;
++    uint256 public TARGET_UTILIZATION;
+     /// @notice Initial rate (scaled by WAD).
+     uint128 public immutable INITIAL_RATE;
+ 
diff --git a/certora/scripts/verifyLiveness.sh b/certora/scripts/verifyLiveness.sh
index 033de521..226ea6b2 100755
--- a/certora/scripts/verifyLiveness.sh
+++ b/certora/scripts/verifyLiveness.sh
@@ -2,6 +2,8 @@
 
 set -euxo pipefail
 
+make -C certora munged
+
 certoraRun \
     src/Irm.sol \
     --verify Irm:certora/specs/Liveness.spec \