diff --git a/espeak-ng-data/voices/mb/mb-es1 b/espeak-ng-data/voices/mb/mb-es1
index d5ffea2d..e27f1e74 100644
--- a/espeak-ng-data/voices/mb/mb-es1
+++ b/espeak-ng-data/voices/mb/mb-es1
@@ -1,3 +1,4 @@
+language es-es 7
 language es 7
 name spanish-mbrola-1
 gender male
diff --git a/espeak-ng-data/voices/mb/mb-es2 b/espeak-ng-data/voices/mb/mb-es2
index d38fa08d..64c52aee 100644
--- a/espeak-ng-data/voices/mb/mb-es2
+++ b/espeak-ng-data/voices/mb/mb-es2
@@ -1,3 +1,4 @@
+language es-es 7
 language es 7
 name spanish-mbrola-2
 gender male
diff --git a/espeak-ng-data/voices/mb/mb-es3 b/espeak-ng-data/voices/mb/mb-es3
index 52464b95..7788c80f 100644
--- a/espeak-ng-data/voices/mb/mb-es3
+++ b/espeak-ng-data/voices/mb/mb-es3
@@ -1,3 +1,4 @@
+language es-es 3
 language es 3
 name spanish-mbrola-3
 gender female
diff --git a/espeak-ng-data/voices/mb/mb-es4 b/espeak-ng-data/voices/mb/mb-es4
index 8de40e5c..464d00b4 100644
--- a/espeak-ng-data/voices/mb/mb-es4
+++ b/espeak-ng-data/voices/mb/mb-es4
@@ -1,3 +1,4 @@
+language es-es 4
 language es 4
 name spanish-mbrola-4
 gender male