diff --git a/src/interfaces/ecpg/ChangeLog b/src/interfaces/ecpg/ChangeLog
index 35349233614..b6c455188e7 100644
--- a/src/interfaces/ecpg/ChangeLog
+++ b/src/interfaces/ecpg/ChangeLog
@@ -510,5 +510,9 @@ Mon Mar  8 17:07:14 CET 1999
 Tue Mar  9 17:26:28 CET 1999
 
 	- Synced preproc.y with gram.y.
+
+Sun Mar 14 15:44:18 CET 1999
+
+	- Synced preproc.y with gram.y.
 	- Set library version to 3.0.0
 	- Set ecpg version to 2.6.0
diff --git a/src/interfaces/ecpg/preproc/preproc.y b/src/interfaces/ecpg/preproc/preproc.y
index 1a19bd87d2c..a1f4750991d 100644
--- a/src/interfaces/ecpg/preproc/preproc.y
+++ b/src/interfaces/ecpg/preproc/preproc.y
@@ -3577,6 +3577,8 @@ a_expr:  attr opt_indirection
 				{	$$ = cat3_str($1, make1_str("<"), $3); }
 		| a_expr '>' a_expr
 				{	$$ = cat3_str($1, make1_str(">"), $3); }
+		| a_expr '=' NULL_P
+                                {       $$ = cat2_str($1, make1_str("= NULL")); }
 		| a_expr '=' a_expr
 				{	$$ = cat3_str($1, make1_str("="), $3); }
 /* not possible in embedded sql		| ':' a_expr