diff --git a/.travis/linux.cross.win32/Dockerfile b/.travis/linux.cross.win32/Dockerfile
index 4bc6b05dc..99c966893 100644
--- a/.travis/linux.cross.win32/Dockerfile
+++ b/.travis/linux.cross.win32/Dockerfile
@@ -14,6 +14,7 @@ RUN \
         nsis \
         tofrodos \
 		g++-mingw-w64 \
+		libz-mingw-w64-dev \
 		qt5base-mingw-w64 \
 		qt5tools-mingw-w64 \
 		qt5translations-mingw-w64 \
diff --git a/.travis/linux.cross.win64/Dockerfile b/.travis/linux.cross.win64/Dockerfile
index 4bc6b05dc..99c966893 100644
--- a/.travis/linux.cross.win64/Dockerfile
+++ b/.travis/linux.cross.win64/Dockerfile
@@ -14,6 +14,7 @@ RUN \
         nsis \
         tofrodos \
 		g++-mingw-w64 \
+		libz-mingw-w64-dev \
 		qt5base-mingw-w64 \
 		qt5tools-mingw-w64 \
 		qt5translations-mingw-w64 \