diff --git a/contrib/jenkins_common.sh b/contrib/jenkins_common.sh
index b86a479..c39b356 100644
--- a/contrib/jenkins_common.sh
+++ b/contrib/jenkins_common.sh
@@ -12,6 +12,22 @@
 
 verify_value_string_arrays_are_terminated.py
 
+# Validate enum fields in header are added to tlv_definition in source file (SYS#5891):
+
+verify_gsm0808_tlv_definition() {
+    set +x;
+    enums=$(grep "GSM0808_IE_" include/osmocom/gsm/protocol/gsm_08_08.h | grep "=" | awk '{ print $1 }')
+    counted_enums=$(for f in $enums; do printf "%-60s %s\n" "$f" "$(grep -c "\[$f\]" src/gsm/gsm0808.c)"; done)
+    missing_enums=$(echo "$counted_enums" | grep -v GSM0808_IE_RESERVED | grep "0$" || true)
+    if [ "x$missing_enums" != "x" ]; then
+        echo "Missing IEs in src/gsm/gsm0808.c!"
+        echo "$missing_enums"
+        exit 1
+    fi
+    set -x;
+}
+verify_gsm0808_tlv_definition
+
 prep_build() {
     _src_dir="$1"
     _build_dir="$2"