diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index b54535e875e..9e6e6e4b3df 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1200,7 +1200,7 @@ if test "$DOTTY" != "echo dotty" ; then
   AC_DEFINE_UNQUOTED([LLVM_PATH_DOTTY],"$DOTTY${EXEEXT}",
    [Define to path to dotty program if found or 'echo dotty' otherwise])
 fi
-AC_PATH_PROGS(XDOT, [xdot, xdot.py], [echo xdot])
+AC_PATH_PROGS(XDOT, [xdot xdot.py], [echo xdot])
 if test "$XDOT" != "echo xdot" ; then
   AC_DEFINE([HAVE_XDOT],[1],[Define if the xdot program is available])
   dnl If we're targeting for mingw we should emit windows paths, not msys
diff --git a/configure b/configure
index b7b26c92d02..715f6ee9db3 100755
--- a/configure
+++ b/configure
@@ -7225,7 +7225,7 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 fi
-for ac_prog in xdot, xdot.py
+for ac_prog in xdot xdot.py
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2