diff --git a/ChangeLog b/ChangeLog
index d7c3a0d..5cdabb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+started 8.9.1 15/2/23
+- fix build with --std=c99 [Schamschula]
+
 started 8.9.0 10/4/20
 - add find_trim
 
diff --git a/configure.ac b/configure.ac
index 02e0520..e3b412c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Process this file with autoconf to produce a configure script.
 
-AC_INIT([nip2], [8.9.0], [vipsip@jiscmail.ac.uk])
+AC_INIT([nip2], [8.9.1], [vipsip@jiscmail.ac.uk])
 
 # foreign stops complaints about a missing README (we use README.md instead)
 # and missing INSTALL (the standard Gnu INSTALL is not very useful)
@@ -17,7 +17,7 @@ dnl
 
 m4_define([nip_major_version], [8])
 m4_define([nip_minor_version], [9])
-m4_define([nip_micro_version], [0])
+m4_define([nip_micro_version], [1])
 m4_define([nip_version],
           [nip_major_version.nip_minor_version.nip_micro_version])
 
diff --git a/src/compile.c b/src/compile.c
index 2d341db..ecf40b8 100644
--- a/src/compile.c
+++ b/src/compile.c
@@ -815,7 +815,7 @@ compile_graph( Compile *compile, ParseNode *pn, PElement *out )
 			break;
 
 		case PARSE_CONST_BOOL:
-			PEPUTP( out, ELEMENT_BOOL, pn->con.val.boolean );
+			PEPUTP( out, ELEMENT_BOOL, pn->con.val.bol );
 			break;
 
 		case PARSE_CONST_ELIST:
@@ -2523,7 +2523,7 @@ compile_pattern_condition( Compile *compile,
 	int i;
 
 	n.type = PARSE_CONST_BOOL;
-	n.val.boolean = TRUE;
+	n.val.bol = TRUE;
 	node = tree_const_new( compile, n );
 
 	for( i = depth - 1; i >= 0; i-- ) {
diff --git a/src/lex.l b/src/lex.l
index de8a152..9cfc2e9 100644
--- a/src/lex.l
+++ b/src/lex.l
@@ -207,7 +207,7 @@ TRUE {
 	BEGIN BINARY;
 
 	yylval.yy_const.type = PARSE_CONST_BOOL;
-	yylval.yy_const.val.boolean = TRUE;
+	yylval.yy_const.val.bol = TRUE;
 
 	return( TK_CONST );
 }
@@ -216,7 +216,7 @@ FALSE {
 	BEGIN BINARY;
 
 	yylval.yy_const.type = PARSE_CONST_BOOL;
-	yylval.yy_const.val.boolean = FALSE;
+	yylval.yy_const.val.bol = FALSE;
 
 	return( TK_CONST );
 }
diff --git a/src/tree.h b/src/tree.h
index 9238a99..8a764bb 100644
--- a/src/tree.h
+++ b/src/tree.h
@@ -126,7 +126,7 @@ struct _ParseConst {
 	union {
 		double num;
 		char *str;
-		gboolean boolean;
+		gboolean bol;
 		int ch;
 	} val;
 };