diff --git a/tests/rules/test_line_length.py b/tests/rules/test_line_length.py
index e2c6bcd..2212c3f 100644
--- a/tests/rules/test_line_length.py
+++ b/tests/rules/test_line_length.py
@@ -84,6 +84,9 @@ class LineLengthTestCase(RuleTestCase):
                    'another:\n'
                    '  - https://localhost/very/very/long/url\n'
                    '...\n', conf)
+        self.check('---\n'
+                   'long_line: http://localhost/very/very/long/url\n', conf,
+                   problem=(2, 21))
 
         conf = 'line-length: {max: 20, allow-non-breakable-words: no}'
         self.check('---\n' + 30 * 'A' + '\n', conf, problem=(2, 21))
@@ -106,3 +109,39 @@ class LineLengthTestCase(RuleTestCase):
                    'another:\n'
                    '  - https://localhost/very/very/long/url\n'
                    '...\n', conf, problem=(5, 21))
+        self.check('---\n'
+                   'long_line: http://localhost/very/very/long/url\n'
+                   '...\n', conf, problem=(2, 21))
+
+        conf = ('line-length: {max: 20, allow-non-breakable-words: yes}\n'
+                'trailing-spaces: disable')
+        self.check('---\n'
+                   'loooooooooong+word+and+some+space+at+the+end       \n',
+                   conf, problem=(2, 21))
+
+    def test_non_breakable_inline_mappings(self):
+        conf = 'line-length: {max: 20, ' \
+               'allow-non-breakable-inline-mappings: yes}'
+        self.check('---\n'
+                   'long_line: http://localhost/very/very/long/url\n'
+                   'long line: http://localhost/very/very/long/url\n', conf)
+        self.check('---\n'
+                   '- long line: http://localhost/very/very/long/url\n', conf)
+
+        self.check('---\n'
+                   'long_line: http://localhost/short/url + word\n'
+                   'long line: http://localhost/short/url + word\n',
+                   conf, problem1=(2, 21), problem2=(3, 21))
+
+        conf = ('line-length: {max: 20,'
+                '              allow-non-breakable-inline-mappings: yes}\n'
+                'trailing-spaces: disable')
+        self.check('---\n'
+                   'long_line: and+some+space+at+the+end       \n',
+                   conf, problem=(2, 21))
+        self.check('---\n'
+                   'long line: and+some+space+at+the+end       \n',
+                   conf, problem=(2, 21))
+        self.check('---\n'
+                   '- long line: and+some+space+at+the+end       \n',
+                   conf, problem=(2, 21))
diff --git a/yamllint/conf/default.yaml b/yamllint/conf/default.yaml
index e2476ce..9eec756 100644
--- a/yamllint/conf/default.yaml
+++ b/yamllint/conf/default.yaml
@@ -38,6 +38,7 @@ rules:
   line-length:
     max: 80
     allow-non-breakable-words: yes
+    allow-non-breakable-inline-mappings: no
   new-line-at-end-of-file: enable
   new-lines:
     type: unix
diff --git a/yamllint/conf/relaxed.yaml b/yamllint/conf/relaxed.yaml
index 343f784..f653757 100644
--- a/yamllint/conf/relaxed.yaml
+++ b/yamllint/conf/relaxed.yaml
@@ -25,3 +25,4 @@ rules:
     indent-sequences: consistent
   line-length:
     level: warning
+    allow-non-breakable-inline-mappings: yes
diff --git a/yamllint/rules/line_length.py b/yamllint/rules/line_length.py
index 8980267..09e8b23 100644
--- a/yamllint/rules/line_length.py
+++ b/yamllint/rules/line_length.py
@@ -23,6 +23,8 @@ Use this rule to set a limit to lines length.
 * ``allow-non-breakable-words`` is used to allow non breakable words (without
   spaces inside) to overflow the limit. This is useful for long URLs, for
   instance. Use ``yes`` to allow, ``no`` to forbid.
+* ``allow-non-breakable-inline-mappings`` implies ``allow-non-breakable-words``
+  and extends it to also allow non-breakable words in inline mappings.
 
 .. rubric:: Examples
 
@@ -61,6 +63,19 @@ Use this rule to set a limit to lines length.
 
     - this line is waaaaaaaaaaaaaay too long but could be easily split...
 
+   and the following code snippet would also **FAIL**:
+   ::
+
+    - foobar: http://localhost/very/very/very/very/very/very/very/very/long/url
+
+#. With ``line-length: {max: 60, allow-non-breakable-words: yes,
+   allow-non-breakable-inline-mappings: yes}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    - foobar: http://localhost/very/very/very/very/very/very/very/very/long/url
+
 #. With ``line-length: {max: 60, allow-non-breakable-words: no}``
 
    the following code snippet would **FAIL**:
@@ -73,17 +88,34 @@ Use this rule to set a limit to lines length.
 """
 
 
+import yaml
+
 from yamllint.linter import LintProblem
 
 
 ID = 'line-length'
 TYPE = 'line'
 CONF = {'max': int,
-        'allow-non-breakable-words': bool}
+        'allow-non-breakable-words': bool,
+        'allow-non-breakable-inline-mappings': bool}
+
+
+def check_inline_mapping(line):
+    loader = yaml.SafeLoader(line.content)
+    while loader.peek_token():
+        if isinstance(loader.get_token(), yaml.BlockMappingStartToken):
+            while loader.peek_token():
+                if isinstance(loader.get_token(), yaml.ValueToken):
+                    t = loader.get_token()
+                    if isinstance(t, yaml.ScalarToken):
+                        return ' ' not in line.content[t.start_mark.column:]
+    return False
 
 
 def check(conf, line):
     if line.end - line.start > conf['max']:
+        conf['allow-non-breakable-words'] |= \
+            conf['allow-non-breakable-inline-mappings']
         if conf['allow-non-breakable-words']:
             start = line.start
             while start < line.end and line.buffer[start] == ' ':
@@ -96,6 +128,10 @@ def check(conf, line):
                 if line.buffer.find(' ', start, line.end) == -1:
                     return
 
+                if (conf['allow-non-breakable-inline-mappings'] and
+                        check_inline_mapping(line)):
+                    return
+
         yield LintProblem(line.line_no, conf['max'] + 1,
                           'line too long (%d > %d characters)' %
                           (line.end - line.start, conf['max']))