diff --git a/ChangeLog b/ChangeLog
index 5f033df..2155764 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2014-10-13  Eric Blake <eblake@redhat.com>
+
+	* cd: support drive letters on Cygwin.
+
 2014-10-08  Herbert Xu <herbert@gondor.apana.org.au>
 
 	* Split unquoted $@/$* correctly when IFS is set but empty.
diff --git a/src/cd.c b/src/cd.c
index 2d9d4b5..a4e024d 100644
--- a/src/cd.c
+++ b/src/cd.c
@@ -38,6 +38,9 @@
 #include <string.h>
 #include <unistd.h>
 #include <limits.h>
+#ifdef __CYGWIN__
+#include <sys/cygwin.h>
+#endif
 
 /*
  * The cd and pwd commands.
@@ -194,6 +197,17 @@
 	char *cdcomppath;
 	const char *lim;
 
+#ifdef __CYGWIN__
+	/* On cygwin, thanks to drive letters, some absolute paths do
+	   not begin with slash; but cygwin includes a function that
+	   forces normalization to the posix form */
+	char pathbuf[PATH_MAX];
+	if (cygwin_conv_path(CCP_WIN_A_TO_POSIX | CCP_RELATIVE, dir, pathbuf,
+			     sizeof(pathbuf)) < 0)
+		sh_error("can't normalize %s", dir);
+	dir = pathbuf;
+#endif
+
 	cdcomppath = sstrdup(dir);
 	STARTSTACKSTR(new);
 	if (*dir != '/') {