diff --git a/ChangeLog b/ChangeLog
index 720a1482..443f2c77 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2000-12-15  Akim Demaille  <akim@epita.fr>
+
+	* m4sugar.m4 (m4_init): Catch `dnl'.
+
 2000-12-15  Pavel Roskin  <proski@gnu.org>
 
 	* m4sh.sh (AS_ERROR): Restore dnl at the end of the macro.
diff --git a/lib/m4sugar/m4sugar.m4 b/lib/m4sugar/m4sugar.m4
index b863b567..b4bed384 100644
--- a/lib/m4sugar/m4sugar.m4
+++ b/lib/m4sugar/m4sugar.m4
@@ -1638,4 +1638,5 @@ m4_ifndef([m4_tmpdir],
 # M4sugar reserves `m4_[A-Za-z0-9_]*'.  We'd need \b and +,
 # but they are not portable.
 m4_pattern_forbid([^m4_])
+m4_pattern_forbid([^dnl$])
 ])
diff --git a/m4sugar.m4 b/m4sugar.m4
index b863b567..b4bed384 100644
--- a/m4sugar.m4
+++ b/m4sugar.m4
@@ -1638,4 +1638,5 @@ m4_ifndef([m4_tmpdir],
 # M4sugar reserves `m4_[A-Za-z0-9_]*'.  We'd need \b and +,
 # but they are not portable.
 m4_pattern_forbid([^m4_])
+m4_pattern_forbid([^dnl$])
 ])