diff --git a/tests/build-remote-content-addressed-floating.sh b/tests/build-remote-content-addressed-floating.sh
index 13ef47d2d..1f474dde0 100644
--- a/tests/build-remote-content-addressed-floating.sh
+++ b/tests/build-remote-content-addressed-floating.sh
@@ -2,7 +2,7 @@ source common.sh
 
 file=build-hook-ca-floating.nix
 
-sed -i 's/experimental-features .*/& ca-derivations/' "$NIX_CONF_DIR"/nix.conf
+enableFeatures "ca-derivations ca-references"
 
 CONTENT_ADDRESSED=true
 
diff --git a/tests/ca/build.sh b/tests/ca/build.sh
index c8877f87f..92f8b429a 100644
--- a/tests/ca/build.sh
+++ b/tests/ca/build.sh
@@ -37,7 +37,7 @@ testCutoffFor () {
 }
 
 testCutoff () {
-    # Don't directly build depenentCA, that way we'll make sure we dodn't rely on
+    # Don't directly build dependentCA, that way we'll make sure we don't rely on
     # dependent derivations always being already built.
     #testDerivation dependentCA
     testCutoffFor transitivelyDependentCA
diff --git a/tests/ca/common.sh b/tests/ca/common.sh
index c5aa34334..b9d415863 100644
--- a/tests/ca/common.sh
+++ b/tests/ca/common.sh
@@ -1,5 +1,5 @@
 source ../common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
+enableFeatures "ca-derivations ca-references"
 
 restartDaemon
diff --git a/tests/ca/duplicate-realisation-in-closure.sh b/tests/ca/duplicate-realisation-in-closure.sh
index 74c5d25fd..da9cd8fb4 100644
--- a/tests/ca/duplicate-realisation-in-closure.sh
+++ b/tests/ca/duplicate-realisation-in-closure.sh
@@ -2,8 +2,6 @@ source ./common.sh
 
 requireDaemonNewerThan "2.4pre20210625"
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
-
 export REMOTE_STORE_DIR="$TEST_ROOT/remote_store"
 export REMOTE_STORE="file://$REMOTE_STORE_DIR"
 
diff --git a/tests/ca/nix-copy.sh b/tests/ca/nix-copy.sh
index 2e0dea2d2..7a8307a4e 100755
--- a/tests/ca/nix-copy.sh
+++ b/tests/ca/nix-copy.sh
@@ -2,9 +2,6 @@
 
 source common.sh
 
-# Globally enable the ca derivations experimental flag
-sed -i 's/experimental-features = .*/& ca-derivations ca-references/' "$NIX_CONF_DIR/nix.conf"
-
 export REMOTE_STORE_DIR="$TEST_ROOT/remote_store"
 export REMOTE_STORE="file://$REMOTE_STORE_DIR"
 
diff --git a/tests/ca/nix-run.sh b/tests/ca/nix-run.sh
index 81402af10..5f46518e8 100755
--- a/tests/ca/nix-run.sh
+++ b/tests/ca/nix-run.sh
@@ -2,8 +2,6 @@
 
 source common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
-
 FLAKE_PATH=path:$PWD
 
 nix run --no-write-lock-file $FLAKE_PATH#runnable
diff --git a/tests/ca/nix-shell.sh b/tests/ca/nix-shell.sh
index 7f1a3a73e..1c5a6639f 100755
--- a/tests/ca/nix-shell.sh
+++ b/tests/ca/nix-shell.sh
@@ -2,8 +2,6 @@
 
 source common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
-
 CONTENT_ADDRESSED=true
 cd ..
 source ./nix-shell.sh
diff --git a/tests/ca/post-hook.sh b/tests/ca/post-hook.sh
index 1c9d4f700..705bde9d4 100755
--- a/tests/ca/post-hook.sh
+++ b/tests/ca/post-hook.sh
@@ -4,8 +4,6 @@ source common.sh
 
 requireDaemonNewerThan "2.4pre20210626"
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
-
 export NIX_TESTS_CA_BY_DEFAULT=1
 cd ..
 source ./post-hook.sh
diff --git a/tests/ca/recursive.sh b/tests/ca/recursive.sh
index 648bf0a91..0354d23b4 100755
--- a/tests/ca/recursive.sh
+++ b/tests/ca/recursive.sh
@@ -4,8 +4,6 @@ source common.sh
 
 requireDaemonNewerThan "2.4pre20210623"
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
-
 export NIX_TESTS_CA_BY_DEFAULT=1
 cd ..
 source ./recursive.sh
diff --git a/tests/ca/signatures.sh b/tests/ca/signatures.sh
index 0c7d974ea..eb18a4130 100644
--- a/tests/ca/signatures.sh
+++ b/tests/ca/signatures.sh
@@ -1,8 +1,5 @@
 source common.sh
 
-# Globally enable the ca derivations experimental flag
-sed -i 's/experimental-features = .*/& ca-derivations ca-references/' "$NIX_CONF_DIR/nix.conf"
-
 clearStore
 clearCache
 
diff --git a/tests/common.sh.in b/tests/common.sh.in
index e485329ba..d12aebdad 100644
--- a/tests/common.sh.in
+++ b/tests/common.sh.in
@@ -173,10 +173,15 @@ needLocalStore() {
 }
 
 # Just to make it easy to find which tests should be fixed
-buggyNeedLocalStore () {
+buggyNeedLocalStore() {
   needLocalStore
 }
 
+enableFeatures() {
+    local features="$1"
+    sed -i 's/experimental-features .*/& '"$features"'/' "$NIX_CONF_DIR"/nix.conf
+}
+
 set -x
 
 if [[ -n "${NIX_DAEMON_PACKAGE:-}" ]]; then
diff --git a/tests/nix-profile.sh b/tests/nix-profile.sh
index 549840767..be80e089a 100644
--- a/tests/nix-profile.sh
+++ b/tests/nix-profile.sh
@@ -3,6 +3,8 @@ source common.sh
 clearStore
 clearProfiles
 
+enableFeatures "ca-derivations ca-references"
+
 # Make a flake.
 flake1Dir=$TEST_ROOT/flake1
 mkdir -p $flake1Dir
@@ -82,13 +84,13 @@ nix profile wipe-history
 # Test upgrade to CA package.
 printf true > $flake1Dir/ca.nix
 printf 3.0 > $flake1Dir/version
-nix profile upgrade --extra-experimental-features ca-derivations 0
+nix profile upgrade 0
 nix profile history | grep "packages.$system.default: 1.0 -> 3.0"
 
 # Test new install of CA package.
 nix profile remove 0
 printf 4.0 > $flake1Dir/version
 printf Utrecht > $flake1Dir/who
-nix profile install --extra-experimental-features ca-derivations $flake1Dir
+nix profile install $flake1Dir
 [[ $($TEST_HOME/.nix-profile/bin/hello) = "Hello Utrecht" ]]
 [[ $(nix path-info --json $(realpath $TEST_HOME/.nix-profile/bin/hello) | jq -r .[].ca) =~ fixed:r:sha256: ]]