diff --git a/devel/avr-gcc-3/Makefile b/devel/avr-gcc-3/Makefile
index 02a92fe4966d..40e316b33309 100644
--- a/devel/avr-gcc-3/Makefile
+++ b/devel/avr-gcc-3/Makefile
@@ -36,6 +36,7 @@ WRKSRC=		${WRKDIR}/gcc-${PORTVERSION}
 # the original master site still uses .gz.
 #USE_BZIP2=	yes
 USE_GMAKE=	yes
+USE_BISON=	yes
 GNU_CONFIGURE=	yes
 
 CONFIGURE_ARGS=	--target=avr
diff --git a/devel/avr-gcc/Makefile b/devel/avr-gcc/Makefile
index 02a92fe4966d..40e316b33309 100644
--- a/devel/avr-gcc/Makefile
+++ b/devel/avr-gcc/Makefile
@@ -36,6 +36,7 @@ WRKSRC=		${WRKDIR}/gcc-${PORTVERSION}
 # the original master site still uses .gz.
 #USE_BZIP2=	yes
 USE_GMAKE=	yes
+USE_BISON=	yes
 GNU_CONFIGURE=	yes
 
 CONFIGURE_ARGS=	--target=avr