diff --git a/Makefile b/Makefile
index c8502798..b53c7a18 100644
--- a/Makefile
+++ b/Makefile
@@ -48,8 +48,8 @@ configure_tests:
 	./test/unit/configure
 
 test: configure_tests
-	SHELL=`command -v bash` ./test/unit/runner
-	SHELL=`command -v zsh`  ./test/unit/runner
+	SHELL=`command -v bash` ./test/unit/runner --norc
+	SHELL=`command -v zsh`  ./test/unit/runner --no-rcs
 
 integration_tests:
 	SHELL=`command -v bash` ./test/integration/runner
diff --git a/test/integration/helper.sh b/test/integration/helper.sh
index 74185bf1..7f053791 100644
--- a/test/integration/helper.sh
+++ b/test/integration/helper.sh
@@ -13,6 +13,6 @@ original_pwd="$PWD"
 original_ruby="$(command -v ruby 2>/dev/null)"
 original_gem="$(command -v gem 2>/dev/null)"
 
-setUp() { return; }
-tearDown() { return; }
-oneTimeTearDown() { return; }
+setUp() { return 0; }
+tearDown() { return 0; }
+oneTimeTearDown() { return 0; }
diff --git a/test/unit/chruby_reset_test.sh b/test/unit/chruby_reset_test.sh
index 5e19ed60..e849efd9 100755
--- a/test/unit/chruby_reset_test.sh
+++ b/test/unit/chruby_reset_test.sh
@@ -15,10 +15,14 @@ function test_chruby_reset_hash_table()
 		assertEquals "did not clear the path table" \
 			     "" "$(hash)"
 	elif [[ -n "$BASH_VERSION" ]]; then
+		local old_lang="$LANG"
+		export LANG=en_US.UTF-8
 		chruby_reset
 
 		assertEquals "did not clear the path table" \
 			     "hash: hash table empty" "$(hash)"
+
+		LANG="$old_lang"
 	fi
 }
 
diff --git a/test/unit/chruby_use_test.sh b/test/unit/chruby_use_test.sh
index 7cd8e049..6d7eb493 100755
--- a/test/unit/chruby_use_test.sh
+++ b/test/unit/chruby_use_test.sh
@@ -8,10 +8,14 @@ function test_chruby_clears_hash_table()
 		assertEquals "did not clear the path table" \
 			     "" "$(hash)"
 	elif [[ -n "$BASH_VERSION" ]]; then
+		local old_lang="$LANG"
+		export LANG=en_US.UTF-8
 		chruby_use "$test_ruby_root" >/dev/null
 
 		assertEquals "did not clear the path table" \
 			     "hash: hash table empty" "$(hash)"
+
+		LANG="$old_lang"
 	fi
 }
 
diff --git a/test/unit/helper.sh b/test/unit/helper.sh
index 218c89ec..31b6bce1 100644
--- a/test/unit/helper.sh
+++ b/test/unit/helper.sh
@@ -20,6 +20,6 @@ chruby_reset
 original_path="$PATH"
 original_pwd="$PWD"
 
-setUp() { return; }
-tearDown() { return; }
-oneTimeTearDown() { return; }
+setUp() { return 0; }
+tearDown() { return 0; }
+oneTimeTearDown() { return 0; }