diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 4c746e7..ba78dfb 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -73,6 +73,9 @@
 msg "test: recursion.pl" # < 1s
 scripts/recursion.pl library/*.c
 
+msg "test: freshness of generated source files" # < 1s
+tests/scripts/check-generated-files.sh
+
 msg "build: cmake, gcc, ASan" # ~ 1 min 50s
 cleanup
 CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
diff --git a/tests/scripts/check-generated-files.sh b/tests/scripts/check-generated-files.sh
new file mode 100755
index 0000000..0400bc7
--- /dev/null
+++ b/tests/scripts/check-generated-files.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# check if generated files are up-to-date
+
+set -eu
+
+if [ -d library -a -d include -a -d tests ]; then :; else
+    echo "Must be run from mbed TLS root" >&2
+    exit 1
+fi
+
+check()
+{
+    FILE=$1
+    SCRIPT=$2
+
+    cp $FILE $FILE.bak
+    $SCRIPT
+    diff $FILE $FILE.bak
+    mv $FILE.bak $FILE
+}
+
+check library/error.c scripts/generate_errors.pl
+check library/version_features.c scripts/generate_features.pl