diff --git a/.travis.yml b/.travis.yml
index 291271c7..6eb26129 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,14 +23,14 @@ script:
  - if [ "$TRAVIS_OS_NAME" = 'linux' -a "$CC" = 'gcc' ]; then make -j $(nproc) CFLAGS='-g0' > /dev/null && cp src/libsodium/.libs/libsodium.so lib.so && make clean > /dev/null && make CFLAGS='-g0' CPPFLAGS='-DSODIUM_C99\(X\)=' > /dev/null && cp src/libsodium/.libs/libsodium.so lib-oldc.so && cmp lib.so lib-oldc.so && echo No binary changes && make clean > /dev/null ; fi
  - make distcheck
  - make distclean > /dev/null
- - CPPFLAGS="-DDEV_MODE=1" ./configure --disable-dependency-tracking --enable-minimal
+ - env CPPFLAGS="-DDEV_MODE=1" ./configure --disable-dependency-tracking --enable-minimal
  - make -j $(nproc)
  - make check
  - ( echo '#include <sodium.h>' ; echo 'int main(void) { return sodium_init(); }' ) > /tmp/main.c && gcc -Isrc/libsodium/include -Isrc/libsodium/include/sodium $(find src -name '*.c' -o -name '*.S') /tmp/main.c
  - make distclean > /dev/null
 
 after_success:
- - CPPFLAGS="-DDEV_MODE=1" ./configure --disable-dependency-tracking --host=powerpc-linux-gnu
+ - env CPPFLAGS="-DDEV_MODE=1" ./configure --disable-dependency-tracking --host=powerpc-linux-gnu
  - make -j $(nproc)
  - env QEMU_LD_PREFIX=/usr/powerpc-linux-gnu make check
  - make clean > /dev/null