diff --git a/tests/test-convert-bzr b/tests/test-convert-bzr
--- a/tests/test-convert-bzr
+++ b/tests/test-convert-bzr
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source "$TESTDIR/bzr-definitions"
+. "$TESTDIR/bzr-definitions"
 
 echo % create and rename on the same file in the same step
 mkdir test-createandrename
diff --git a/tests/test-convert-bzr-directories b/tests/test-convert-bzr-directories
--- a/tests/test-convert-bzr-directories
+++ b/tests/test-convert-bzr-directories
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source "$TESTDIR/bzr-definitions"
+. "$TESTDIR/bzr-definitions"
 
 echo % empty directory
 mkdir test-empty
diff --git a/tests/test-convert-bzr-ghosts b/tests/test-convert-bzr-ghosts
--- a/tests/test-convert-bzr-ghosts
+++ b/tests/test-convert-bzr-ghosts
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source "$TESTDIR/bzr-definitions"
+. "$TESTDIR/bzr-definitions"
 
 cat > ghostcreator.py <<EOF
 import sys
diff --git a/tests/test-convert-bzr-merges b/tests/test-convert-bzr-merges
--- a/tests/test-convert-bzr-merges
+++ b/tests/test-convert-bzr-merges
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source "$TESTDIR/bzr-definitions"
+. "$TESTDIR/bzr-definitions"
 
 echo % test multiple merges at once
 mkdir test-multimerge
diff --git a/tests/test-convert-bzr-treeroot b/tests/test-convert-bzr-treeroot
--- a/tests/test-convert-bzr-treeroot
+++ b/tests/test-convert-bzr-treeroot
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source "$TESTDIR/bzr-definitions"
+. "$TESTDIR/bzr-definitions"
 
 cat > treeset.py <<EOF
 import sys