diff --git a/hgext/convert/common.py b/hgext/convert/common.py
--- a/hgext/convert/common.py
+++ b/hgext/convert/common.py
@@ -365,7 +365,7 @@ class mapfile(dict):
             return
         for i, line in enumerate(fp):
             try:
-                key, value = line[:-1].rsplit(' ', 1)
+                key, value = line.splitlines()[0].rsplit(' ', 1)
             except ValueError:
                 raise util.Abort(_('syntax error in %s(%d): key/value pair expected')
                                  % (self.path, i+1))
diff --git a/tests/test-convert-hg-source b/tests/test-convert-hg-source
--- a/tests/test-convert-hg-source
+++ b/tests/test-convert-hg-source
@@ -38,6 +38,25 @@ cd new
 hg out ../orig
 cd ..
 
+echo '% check shamap LF and CRLF handling'
+cat > rewrite.py <<EOF
+import sys
+# Interlace LF and CRLF
+lines = [(l.rstrip() + ((i % 2) and '\n' or '\r\n'))
+         for i, l in enumerate(file(sys.argv[1]))]
+file(sys.argv[1], 'wb').write(''.join(lines))
+EOF
+python rewrite.py new/.hg/shamap
+cd orig
+hg up -qC 1
+echo foo >> foo
+hg ci -qm 'change foo again'
+hg up -qC 2
+echo foo >> foo
+hg ci -qm 'change foo again again'
+cd ..
+hg convert --datesort orig new 2>&1 | grep -v 'subversion python bindings could not be loaded'
+
 echo % init broken repository
 hg init broken
 cd broken
diff --git a/tests/test-convert-hg-source.out b/tests/test-convert-hg-source.out
--- a/tests/test-convert-hg-source.out
+++ b/tests/test-convert-hg-source.out
@@ -20,6 +20,12 @@ 0 mark baz executable
 comparing with ../orig
 searching for changes
 no changes found
+% check shamap LF and CRLF handling
+scanning source...
+sorting...
+converting...
+1 change foo again again
+0 change foo again
 % init broken repository
 created new head
 % break it