diff --git a/test/run-tests.sh b/test/run-tests.sh
index 77aa8478..b6e62857 100755
--- a/test/run-tests.sh
+++ b/test/run-tests.sh
@@ -25,6 +25,7 @@ fi
 pushd pokecrystal
 git fetch
 git checkout 06e169d
+make clean
 make -j
 make compare
 popd
@@ -35,6 +36,7 @@ fi
 pushd pokered
 git fetch
 git checkout 98f09b6
+make clean
 make -j
 make compare
 popd
@@ -45,5 +47,6 @@ fi
 pushd ucity
 git fetch
 git checkout 3315601
+make clean
 make -j
 popd