diff --git a/lisp/ob-C.el b/lisp/ob-C.el
index 23fe0e106..5858b55ca 100644
--- a/lisp/ob-C.el
+++ b/lisp/ob-C.el
@@ -38,6 +38,8 @@
 (declare-function org-entry-get "org"
 		  (pom property &optional inherit literal-nil))
 
+
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("C++" . "cpp"))
 
 (defvar org-babel-default-header-args:C '())
diff --git a/lisp/ob-asymptote.el b/lisp/ob-asymptote.el
index e94444793..06439b27d 100644
--- a/lisp/ob-asymptote.el
+++ b/lisp/ob-asymptote.el
@@ -49,6 +49,7 @@
 (declare-function orgtbl-to-generic "org-table" (table params))
 (declare-function org-combine-plists "org" (&rest plists))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("asymptote" . "asy"))
 
 (defvar org-babel-default-header-args:asymptote
diff --git a/lisp/ob-awk.el b/lisp/ob-awk.el
index b69e800e4..3c2c23e26 100644
--- a/lisp/ob-awk.el
+++ b/lisp/ob-awk.el
@@ -42,6 +42,7 @@
 (declare-function org-babel-ref-resolve "ob-ref" (ref))
 (declare-function orgtbl-to-generic "org-table" (table params))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
 
 (defvar org-babel-awk-command "awk"
diff --git a/lisp/ob-clojure.el b/lisp/ob-clojure.el
index cc6c2de56..0e77e03dd 100644
--- a/lisp/ob-clojure.el
+++ b/lisp/ob-clojure.el
@@ -42,6 +42,7 @@
 
 (declare-function slime-eval "ext:slime" (sexp &optional package))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("clojure" . "clj"))
 
 (defvar org-babel-default-header-args:clojure '())
diff --git a/lisp/ob-haskell.el b/lisp/ob-haskell.el
index 9f35f59bc..4e3e797f4 100644
--- a/lisp/ob-haskell.el
+++ b/lisp/ob-haskell.el
@@ -51,6 +51,7 @@
 (declare-function inferior-haskell-load-file
 		  "ext:inf-haskell" (&optional reload))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("haskell" . "hs"))
 
 (defvar org-babel-default-header-args:haskell '())
diff --git a/lisp/ob-latex.el b/lisp/ob-latex.el
index 3e00c0ea4..57e0c56e5 100644
--- a/lisp/ob-latex.el
+++ b/lisp/ob-latex.el
@@ -37,6 +37,7 @@
 (declare-function org-splice-latex-header "org"
 		  (tpl def-pkg pkg snippets-p &optional extra))
 (declare-function org-export-latex-fix-inputenc "org-latex" ())
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("latex" . "tex"))
 
 (defvar org-format-latex-header)
diff --git a/lisp/ob-lisp.el b/lisp/ob-lisp.el
index a576f9782..0fcd4433e 100644
--- a/lisp/ob-lisp.el
+++ b/lisp/ob-lisp.el
@@ -36,6 +36,7 @@
 
 (declare-function slime-eval "ext:slime" (sexp &optional package))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("lisp" . "lisp"))
 
 (defvar org-babel-default-header-args:lisp '())
diff --git a/lisp/ob-ocaml.el b/lisp/ob-ocaml.el
index 1a21d152f..384fb3d5f 100644
--- a/lisp/ob-ocaml.el
+++ b/lisp/ob-ocaml.el
@@ -44,6 +44,7 @@
 (declare-function tuareg-run-caml "ext:tuareg" ())
 (declare-function tuareg-interactive-send-input "ext:tuareg" ())
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("ocaml" . "ml"))
 
 (defvar org-babel-default-header-args:ocaml '())
diff --git a/lisp/ob-perl.el b/lisp/ob-perl.el
index ecb66d90b..728c82226 100644
--- a/lisp/ob-perl.el
+++ b/lisp/ob-perl.el
@@ -31,6 +31,7 @@
 (require 'ob-eval)
 (eval-when-compile (require 'cl))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("perl" . "pl"))
 
 (defvar org-babel-default-header-args:perl '())
diff --git a/lisp/ob-python.el b/lisp/ob-python.el
index 6cb2c4485..5ffdb94d2 100644
--- a/lisp/ob-python.el
+++ b/lisp/ob-python.el
@@ -38,6 +38,7 @@
 (declare-function py-toggle-shells "ext:python-mode" (arg))
 (declare-function run-python "ext:python" (&optional cmd noshow new))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("python" . "py"))
 
 (defvar org-babel-default-header-args:python '())
diff --git a/lisp/ob-ruby.el b/lisp/ob-ruby.el
index da539128f..922223a44 100644
--- a/lisp/ob-ruby.el
+++ b/lisp/ob-ruby.el
@@ -46,6 +46,7 @@
 (declare-function run-ruby "ext:inf-ruby" (&optional command name))
 (declare-function xmp "ext:rcodetools" (&optional option))
 
+(defvar org-babel-tangle-lang-exts)
 (add-to-list 'org-babel-tangle-lang-exts '("ruby" . "rb"))
 
 (defvar org-babel-default-header-args:ruby '())