diff --git a/ChangeLog b/ChangeLog
index 52bb6991..01407529 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2005-11-14  Akim Demaille  <akim@epita.fr>
+
+	* data/glr.c (yyexpandGLRStack): Declare only if defined.
+
 2005-11-14  Akim Demaille  <akim@epita.fr>
 
 	* data/glr.cc: New.
diff --git a/data/glr.c b/data/glr.c
index f427cfa9..f9792b32 100644
--- a/data/glr.c
+++ b/data/glr.c
@@ -783,7 +783,9 @@ struct yyGLRStack {
   yyGLRStateSet yytops;
 };
 
+#if YYSTACKEXPANDABLE
 static void yyexpandGLRStack (yyGLRStack* yystack);
+#endif
 
 static void yyFail (yyGLRStack* yystack]b4_pure_formals[, const char* yymsg)
   __attribute__ ((__noreturn__));