diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index a2e9d2f405f..cf1d3d5f6d8 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -15,7 +15,7 @@ register = Library()
 
 def addslashes(value):
     "Adds slashes - useful for passing strings to JavaScript, for example."
-    return value.replace('"', '\\"').replace("'", "\\'")
+    return value.replace('\\', '\\\\').replace('"', '\\"').replace("'", "\\'")
 
 def capfirst(value):
     "Capitalizes the first character of the value"
diff --git a/tests/regressiontests/defaultfilters/tests.py b/tests/regressiontests/defaultfilters/tests.py
index 9b1cfda833c..32d6ef5202b 100644
--- a/tests/regressiontests/defaultfilters/tests.py
+++ b/tests/regressiontests/defaultfilters/tests.py
@@ -15,6 +15,9 @@ r"""
 >>> addslashes('"double quotes" and \'single quotes\'')
 '\\"double quotes\\" and \\\'single quotes\\\''
 
+>>> addslashes(r'\ : backslashes, too')
+'\\\\ : backslashes, too'
+
 >>> capfirst('hello world')
 'Hello world'