diff --git a/core/stream.c b/core/stream.c
index 0880c50..536642e 100644
--- a/core/stream.c
+++ b/core/stream.c
@@ -9,7 +9,7 @@
 #define IDX_STDOUT 1
 #define IDX_STDERR 2
 
-static b_status stdio_read(
+static enum b_status stdio_read(
 	struct b_stream *stream, unsigned char *out, size_t max, size_t *nr_read)
 {
 	FILE *fp = stream->s_ptr;
@@ -25,7 +25,7 @@ static b_status stdio_read(
 	return status;
 }
 
-static b_status stdio_write(
+static enum b_status stdio_write(
 	struct b_stream *stream, const unsigned char *data, size_t count,
 	size_t *nr_written)
 {
@@ -41,20 +41,50 @@ static b_status stdio_write(
 	return status;
 }
 
+static enum b_status stdio_seek(
+	struct b_stream *stream, long long offset, b_stream_seek_origin origin)
+{
+	FILE *fp = stream->s_ptr;
+	int whence = 0;
+	switch (origin) {
+	case B_STREAM_SEEK_START:
+		whence = SEEK_SET;
+		break;
+	case B_STREAM_SEEK_CURRENT:
+		whence = SEEK_CUR;
+		break;
+	case B_STREAM_SEEK_END:
+		whence = SEEK_END;
+		break;
+	default:
+		return B_ERR_INVALID_ARGUMENT;
+	}
+
+	int ret = fseek(fp, offset, whence);
+	if (ret != 0) {
+		return B_ERR_NOT_SUPPORTED;
+	}
+
+	return B_SUCCESS;
+}
+
 static struct b_stream stdio[] = {
 	[IDX_STDIN] = {
 		.s_mode = B_STREAM_READ,
 		.s_read = stdio_read,
+		.s_seek = stdio_seek,
 		.s_ptr = NULL, /* set to stdin (stdio.h) at runtime */
 	},
 	[IDX_STDOUT] = {
 		.s_mode = B_STREAM_WRITE,
 		.s_write = stdio_write,
+		.s_seek = stdio_seek,
 		.s_ptr = NULL, /* set to stdout (stdio.h) at runtime */
 	},
 	[IDX_STDERR] = {
 		.s_mode = B_STREAM_WRITE,
 		.s_write = stdio_write,
+		.s_seek = stdio_seek,
 		.s_ptr = NULL, /* set to stderr (stdio.h) at runtime */
 	},
 };
@@ -138,6 +168,7 @@ struct b_stream *b_stream_open_fp(FILE *fp)
 	stream->s_ptr = fp;
 	stream->s_read = stdio_read;
 	stream->s_write = stdio_write;
+	stream->s_seek = stdio_seek;
 
 	return stream;
 }