diff --git a/sys/crypto/modes/ccm.c b/sys/crypto/modes/ccm.c
index 0ca5653030..406a315ddb 100644
--- a/sys/crypto/modes/ccm.c
+++ b/sys/crypto/modes/ccm.c
@@ -174,7 +174,7 @@ int cipher_encrypt_ccm(cipher_t *cipher,
         return CCM_ERR_INVALID_DATA_LENGTH;
     }
 
-    /* MAC calulation (T) with additional data and plaintext */
+    /* MAC calculation (T) with additional data and plaintext */
     len = ccm_compute_adata_mac(cipher, auth_data, auth_data_len, mac_iv);
     if (len < 0) {
         return len;
@@ -259,7 +259,7 @@ int cipher_decrypt_ccm(cipher_t *cipher,
         return CCM_ERR_INVALID_DATA_LENGTH;
     }
 
-    /* MAC calulation (T) with additional data and plaintext */
+    /* MAC calculation (T) with additional data and plaintext */
     len = ccm_compute_adata_mac(cipher, auth_data, auth_data_len, mac_iv);
     if (len < 0) {
         return len;
diff --git a/sys/crypto/modes/ocb.c b/sys/crypto/modes/ocb.c
index 7777f55597..2aa3e43031 100644
--- a/sys/crypto/modes/ocb.c
+++ b/sys/crypto/modes/ocb.c
@@ -331,7 +331,7 @@ int32_t cipher_decrypt_ocb(cipher_t *cipher, uint8_t *auth_data,
                                     OCB_MODE_DECRYPT);
 
     if (plain_text_length < 0) {
-        // An error occurred. Retur the error code
+        // An error occurred. Return the error code
         return plain_text_length;
     }
     /* Check the tag */