diff --git a/mie/include/mie/ir/builder.h b/mie/include/mie/ir/builder.h
index a7df61c..5ff888a 100644
--- a/mie/include/mie/ir/builder.h
+++ b/mie/include/mie/ir/builder.h
@@ -1,6 +1,7 @@
 #ifndef MIE_IR_BUILDER_H_
 #define MIE_IR_BUILDER_H_
 
+#include <mie/ir/emit.h>
 #include <mie/misc.h>
 #include <stddef.h>
 
@@ -30,9 +31,9 @@ MIE_API void mie_builder_step_into_block(
 MIE_API void mie_builder_step_out(struct mie_builder *builder);
 
 MIE_API struct mie_op *mie_builder_put_op(
-	struct mie_builder *, const char *dialect, const char *op,
+	struct mie_builder *builder, const char *dialect, const char *op,
 	struct mie_register **args, size_t nr_args);
 MIE_API enum mie_status mie_builder_put_name(
-	struct mie_builder *, struct mie_name *name, const char *hint);
+	struct mie_builder *builder, struct mie_name *name, const char *hint);
 
 #endif
diff --git a/mie/ir/builder.c b/mie/ir/builder.c
index 42ed8c1..84183d4 100644
--- a/mie/ir/builder.c
+++ b/mie/ir/builder.c
@@ -1,6 +1,7 @@
 #include <mie/ctx.h>
 #include <mie/ir/block.h>
 #include <mie/ir/builder.h>
+#include <mie/ir/emit.h>
 #include <mie/ir/op-definition.h>
 #include <mie/ir/op.h>
 #include <mie/ir/region.h>
@@ -13,6 +14,7 @@ struct builder_scope {
 };
 
 struct mie_builder {
+	struct mie_emitter b_base;
 	struct mie_ctx *b_ctx;
 	b_queue b_scope_stack;
 	struct mie_op *b_root;
@@ -28,6 +30,11 @@ struct mie_builder *mie_builder_create(struct mie_ctx *ctx, struct mie_op *root)
 
 	memset(out, 0x0, sizeof *out);
 
+	out->b_base.e_get_ctx = (mie_emit_get_ctx)mie_builder_get_ctx;
+	out->b_base.e_put_op = (mie_emit_put_op)mie_builder_put_op;
+	out->b_base.e_put_name = (mie_emit_put_name)mie_builder_put_name;
+	out->b_base.e_put_block = NULL;
+
 	out->b_ctx = ctx;
 	out->b_root = root;