diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,10 @@
 # Changelog for commonmark-extensions
 
+## 0.2.1.2
+
+- Fix bug with absolute paths in rebase_relative_paths
+  extension on Windows.
+
 ## 0.2.1.1
 
 - Fix bug in wikilinks extensions.
diff --git a/commonmark-extensions.cabal b/commonmark-extensions.cabal
--- a/commonmark-extensions.cabal
+++ b/commonmark-extensions.cabal
@@ -1,5 +1,5 @@
 name:           commonmark-extensions
-version:        0.2.1.1
+version:        0.2.1.2
 synopsis:       Pure Haskell commonmark parser.
 description:
    This library provides some useful extensions to core commonmark
diff --git a/src/Commonmark/Extensions/RebaseRelativePaths.hs b/src/Commonmark/Extensions/RebaseRelativePaths.hs
--- a/src/Commonmark/Extensions/RebaseRelativePaths.hs
+++ b/src/Commonmark/Extensions/RebaseRelativePaths.hs
@@ -14,6 +14,8 @@
 import Text.Parsec (getPosition)
 import Text.Parsec.Pos (sourceName)
 import System.FilePath
+import qualified System.FilePath.Windows as Windows
+import qualified System.FilePath.Posix as Posix
 import Network.URI (URI (uriScheme), parseURI)
 import qualified Data.Set as Set
 #if !MIN_VERSION_base(4,11,0)
@@ -66,7 +68,9 @@
 rebasePath pos path = do
   let fp = sourceName pos
       isFragment = T.take 1 path == "#"
-   in if T.null path || isFragment || isAbsolute (T.unpack path) || isURI path
+      path' = T.unpack path
+      isAbsolutePath = Posix.isAbsolute path' || Windows.isAbsolute path'
+   in if T.null path || isFragment || isAbsolutePath || isURI path
          then path
          else
            case takeDirectory fp of
diff --git a/test/test-commonmark-extensions.hs b/test/test-commonmark-extensions.hs
--- a/test/test-commonmark-extensions.hs
+++ b/test/test-commonmark-extensions.hs
@@ -156,6 +156,7 @@
             , "![image]()"
             , "[link](#foobar)"
             , "![image][ref]"
+            , "![image](/absolute/path.jpg)"
             , ""
             ]
   let mdref = "[ref]: baz.png"
@@ -168,7 +169,8 @@
                  , "<a href=\"http://example.com/foo.jpg\">link</a>"
                  , "<img src=\"\" alt=\"image\" />"
                  , "<a href=\"#foobar\">link</a>"
-                 , "<img src=\"extra/baz.png\" alt=\"image\" /></p>"
+                 , "<img src=\"extra/baz.png\" alt=\"image\" />"
+                 , "<img src=\"/absolute/path.jpg\" alt=\"image\" /></p>"
                  ]
   testCase "rebase_relative_paths" (actual @?= expected)