diff --git a/Makefile.am b/Makefile.am
index 8baa139d..80040e92 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -868,6 +868,7 @@ mbrola: \
 	espeak-ng-data/mbrola_ph/en1_phtrans \
 	espeak-ng-data/mbrola_ph/es_phtrans \
 	espeak-ng-data/mbrola_ph/es3_phtrans \
+	espeak-ng-data/mbrola_ph/es4_phtrans \
 	espeak-ng-data/mbrola_ph/fr_phtrans \
 	espeak-ng-data/mbrola_ph/gr2_phtrans \
 	espeak-ng-data/mbrola_ph/grc-de6_phtrans \
@@ -949,6 +950,10 @@ espeak-ng-data/mbrola_ph/es3_phtrans: phsource/mbrola/es3 src/espeak-ng
 	mkdir -p espeak-ng-data/mbrola_ph
 	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/es3
 
+espeak-ng-data/mbrola_ph/es4_phtrans: phsource/mbrola/es4 src/espeak-ng
+	mkdir -p espeak-ng-data/mbrola_ph
+	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/es4
+
 espeak-ng-data/mbrola_ph/fr_phtrans: phsource/mbrola/fr src/espeak-ng
 	mkdir -p espeak-ng-data/mbrola_ph
 	ESPEAK_DATA_PATH=$(PWD) src/espeak-ng --compile-mbrola=phsource/mbrola/fr
diff --git a/docs/mbrola.md b/docs/mbrola.md
index fd9dd95f..21f5f17b 100644
--- a/docs/mbrola.md
+++ b/docs/mbrola.md
@@ -78,7 +78,7 @@ The following MBROLA voices are available. Not all are supported by eSpeak NG.
 | `es1`        | Spanish              | male   | `mb-es1` | `mbrola-es1`   |
 | `es2`        | Spanish              | male   | `mb-es2` | `mbrola-es2`   |
 | `es3`        | Spanish              | female | `mb-es3` |                |
-| `es4`        | Spanish              | male   |          |                |
+| `es4`        | Spanish              | male   | `mb-es4` |                |
 | `fr1`        | French               | male   | `mb-fr1` | `mbrola-fr1`   |
 | `fr2`        | French               | female | `mb-fr2` |                |
 | `fr3`        | French               | male   | `mb-fr3` |                |
diff --git a/espeak-ng-data/voices/mb/mb-es4 b/espeak-ng-data/voices/mb/mb-es4
new file mode 100644
index 00000000..8de40e5c
--- /dev/null
+++ b/espeak-ng-data/voices/mb/mb-es4
@@ -0,0 +1,4 @@
+language es 4
+name spanish-mbrola-4
+gender male
+mbrola es4 es4_phtrans
diff --git a/phsource/mbrola/es4 b/phsource/mbrola/es4
new file mode 100644
index 00000000..3691eb93
--- /dev/null
+++ b/phsource/mbrola/es4
@@ -0,0 +1,45 @@
+volume 15
+0  a   NULL  0   a
+0  a/  NULL  0   a
+0  a:  NULL  50  a   a
+0  B   NULL  0   b
+0  b   NULL  0   b
+0  D   NULL  0   d
+0  E   NULL  0   e
+0  e   NULL  0   e
+0  e/  NULL  0   e
+0  e:  NULL  50  e   e
+0  f   NULL  0   f
+0  g   NULL  0   g
+0  h   NULL  0   jj
+0  i   NULL  0   i
+0  i:  NULL  50  i   i
+0  y   NULL  0   i
+0  j   NULL  0   j
+0  k   NULL  0   k
+0  l   NULL  0   L
+0  l/  NULL  0   L
+0  m   NULL  0   m
+0  n^  NULL  0   J
+0  N   NULL  0   n
+0  n   NULL  0   n
+0  **  NULL  0   jj
+0  o   NULL  0   o
+0  o/  NULL  0   o
+0  o:  NULL  50  o   o
+0  p   NULL  0   p
+0  Q   NULL  0   jj
+0  q   NULL  0   k
+0  r   NULL  0   r
+0  R   NULL  0   rr
+0  s   NULL  0   s
+0  T   NULL  0   T
+0  t   NULL  0   t
+0  tS  NULL  0   tS
+0  u   NULL  0   u
+0  u:  NULL  50  u   u
+0  v   NULL  0   b
+0  v#  NULL  0   b
+0  w   NULL  0   b
+0  x   NULL  0   x
+0  z   NULL  0   z