diff --git a/.travis/install.sh b/.travis/install.sh
index 915fc5d05..cebe5ce72 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -3,6 +3,7 @@
 set -e
 
 sudo apt-get install -y \
+    g++-multilib \
     pkg-config \
     pyqt5-dev-tools \
     python3-pyqt5.qtsvg \
diff --git a/.travis/script-win32.sh b/.travis/script-win32.sh
index 7c2dad5a6..07c32ce04 100755
--- a/.travis/script-win32.sh
+++ b/.travis/script-win32.sh
@@ -12,6 +12,7 @@ export CFLAGS="${_FLAGS}"
 export CXXFLAGS="${_FLAGS}"
 export PATH=/opt/mingw32/${_PREFIX}/bin:/opt/mingw32/bin:${PATH}
 export PKG_CONFIG_PATH=/opt/mingw32/lib/pkgconfig:${PKG_CONFIG_PATH}
+export CROSS_COMPILING=true
 
 # Start clean
 make distclean >/dev/null
diff --git a/.travis/script-win64.sh b/.travis/script-win64.sh
index 6d50ce6cb..378885e77 100755
--- a/.travis/script-win64.sh
+++ b/.travis/script-win64.sh
@@ -12,6 +12,7 @@ export CFLAGS="${_FLAGS}"
 export CXXFLAGS="${_FLAGS}"
 export PATH=/opt/mingw64/${_PREFIX}/bin:/opt/mingw64/bin:${PATH}
 export PKG_CONFIG_PATH=/opt/mingw64/lib/pkgconfig:${PKG_CONFIG_PATH}
+export CROSS_COMPILING=true
 
 # Start clean
 make distclean >/dev/null