diff --git a/mantisbt/Dockerfile b/mantisbt/Dockerfile
index c6866dd..bf15a26 100644
--- a/mantisbt/Dockerfile
+++ b/mantisbt/Dockerfile
@@ -9,8 +9,8 @@ RUN a2enmod rewrite
 
 RUN set -xe \
     && apt-get update \
-    && apt-get install -y libpng-dev libjpeg-dev libpq-dev libxml2-dev \
-    && docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr \
+    && apt-get install -y libfreetype6-dev libpng-dev libjpeg-dev libpq-dev libxml2-dev \
+    && docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr --with-freetype-dir=/usr \
     && docker-php-ext-install gd mbstring mysql mysqli pgsql soap \
     && rm -rf /var/lib/apt/lists/*