diff --git a/src/conv.c b/src/conv.c
index f13deef..79b3a7c 100644
--- a/src/conv.c
+++ b/src/conv.c
@@ -238,6 +238,11 @@
 
 #define MAX_AE 0x00ffffff
 
+/* Forward declaration for accerlated decoding with certain codes */
+int
+osmo_conv_decode_acc(const struct osmo_conv_code *code,
+                     const sbit_t *input, ubit_t *output);
+
 void
 osmo_conv_decode_init(struct osmo_conv_decoder *decoder,
                       const struct osmo_conv_code *code, int len, int start_state)
@@ -606,6 +611,10 @@
 	struct osmo_conv_decoder decoder;
 	int rv, l;
 
+	/* Use accelerated implementation for supported codes */
+	if ((code->N <= 4) && ((code->K == 5) || (code->K == 7)))
+		return osmo_conv_decode_acc(code, input, output);
+
 	osmo_conv_decode_init(&decoder, code, 0, 0);
 
 	if (code->term == CONV_TERM_TAIL_BITING) {