diff --git a/.travis-lin-mingw.sh b/.travis-lin-mingw.sh
new file mode 100755
index 000000000..0422a06f6
--- /dev/null
+++ b/.travis-lin-mingw.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+DIR=$PWD
+
+if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+	echo "WORK DIR:$DIR"
+	mkdir -p $DIR/build/linux-mingw32-release
+	cd $DIR/build/linux-mingw32-release
+	echo "cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=./cmake/linux-mingw32.cmake -DCMAKE_INSTALL_PREFIX=$PWD/_install $DIR"
+	cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=./cmake/linux-mingw32.cmake -DCMAKE_INSTALL_PREFIX=$PWD/_install $DIR 
+	echo "make"
+	make
+fi
+
diff --git a/.travis.yml b/.travis.yml
index b0f985012..b1832d57f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,9 +18,12 @@ addons:
       - g++-6
       - gcc-6
       - libusb-1.0.0-dev
+      - p7zip
+      - mingw-w64
 
 script:
   - git fetch --tags
   - printenv
   - cmake --version
   - ./.travis.sh
+  - ./.travis-lin-mingw.sh
diff --git a/cmake/modules/FindLibUSB.cmake b/cmake/modules/FindLibUSB.cmake
index 5233e489d..2ad35b3d8 100644
--- a/cmake/modules/FindLibUSB.cmake
+++ b/cmake/modules/FindLibUSB.cmake
@@ -84,7 +84,8 @@ if(NOT LIBUSB_FOUND)
         file(MAKE_DIRECTORY ${LIBUSB_WIN_OUTPUT_FOLDER})
 
         if(${ZIP_EXECUTABLE} MATCHES "p7zip")
-            execute_process(COMMAND ${ZIP_EXECUTABLE} -d --keep -f ${LIBUSB_WIN_ARCHIVE_PATH} WORKING_DIRECTORY ${LIBUSB_WIN_OUTPUT_FOLDER})
+            #execute_process(COMMAND ${ZIP_EXECUTABLE} -d --keep -f ${LIBUSB_WIN_ARCHIVE_PATH} WORKING_DIRECTORY ${LIBUSB_WIN_OUTPUT_FOLDER})
+            execute_process(COMMAND ${ZIP_EXECUTABLE} -d ${LIBUSB_WIN_ARCHIVE_PATH} WORKING_DIRECTORY ${LIBUSB_WIN_OUTPUT_FOLDER})
         else()
             execute_process(COMMAND ${ZIP_EXECUTABLE} x -y ${LIBUSB_WIN_ARCHIVE_PATH} -o${LIBUSB_WIN_OUTPUT_FOLDER})
         endif()
diff --git a/src/usb.c b/src/usb.c
index 9df9d7296..81bd7ae2c 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -189,7 +189,7 @@ int _stlink_usb_version(stlink_t *sl) {
         cmd[i++] = STLINK_APIV3_GET_VERSION_EX;
 
         size = send_recv(slu, 1, cmd, slu->cmd_len, data, rep_len);
-        if (size != rep_len) {
+        if (size != (ssize_t)rep_len) {
             printf("[!] send_recv STLINK_APIV3_GET_VERSION_EX\n");
             return (int) size;
         }