diff --git a/lib/include/srslte/phy/fec/polar/polar_code.h b/lib/include/srslte/phy/fec/polar/polar_code.h
index 5500eb676..fe70685c1 100644
--- a/lib/include/srslte/phy/fec/polar/polar_code.h
+++ b/lib/include/srslte/phy/fec/polar/polar_code.h
@@ -381,7 +381,7 @@ static inline const uint16_t* get_blk_interleaver(uint8_t n)
       return blk_interleaver_10;
       break;
     default:
-      ERROR("Wrong code_size_log\n");
+      ERROR("Wrong code_size_log (%d)\n", n);
       return NULL;
   }
 }
diff --git a/lib/src/phy/fec/polar/polar_code.c b/lib/src/phy/fec/polar/polar_code.c
index 9a95d690d..b4d39fb33 100644
--- a/lib/src/phy/fec/polar/polar_code.c
+++ b/lib/src/phy/fec/polar/polar_code.c
@@ -104,8 +104,9 @@ int get_code_params(srslte_polar_code_t* c, const uint16_t K, const uint16_t E,
     case 10:
       // iil = false
       if (K < 18 || (K > 25 && K < 31) || K > 1023) {
-        ERROR("Codeblock length (K) not supported for uplink transmission, choose K > 17 and K < 1024, "
-              "excluding 31 > K > 25\n");
+        ERROR("Codeblock length (K=%d) not supported for uplink transmission, choose K > 17 and K < 1024, "
+              "excluding 31 > K > 25\n",
+              K);
         return -1;
       }
       break;