diff --git a/src/exchange/taler-exchange-httpd_config.h b/src/exchange/taler-exchange-httpd_config.h
index e7e6a0a29..7763cdeb5 100644
--- a/src/exchange/taler-exchange-httpd_config.h
+++ b/src/exchange/taler-exchange-httpd_config.h
@@ -48,7 +48,7 @@
  * Manages a /config call.
  *
  * @param rc context of the handler
- * @param[in,out] args remaining arguments (ingored)
+ * @param[in,out] args remaining arguments (ignored)
  * @return MHD result code
  */
 MHD_RESULT
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 5aa22b532..2f58e9cd3 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -5946,7 +5946,7 @@ GNUNET_CRYPTO_EcdsaPublicKey
 TALER_age_commitment_base_public_key;
 
 /**
- * @brief Similiar to TALER_age_restriction_commit, but takes the coin's
+ * @brief Similar to TALER_age_restriction_commit, but takes the coin's
  * private key as seed input and calculates the public keys in the slots larger
  * than the given age as derived from TALER_age_commitment_base_public_key.
  *
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index e05ddeed9..962bccaa2 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1053,7 +1053,7 @@ struct TALER_EXCHANGEDB_CollectableBlindcoin
 
 /**
  * @brief Information we keep for an age-withdraw commitment
- * to reproduce the /age-withdraw operation if neede, and to have proof
+ * to reproduce the /age-withdraw operation if needed, and to have proof
  * that a reserve was drained by this amount.
  */
 struct TALER_EXCHANGEDB_AgeWithdrawCommitment
@@ -1097,7 +1097,7 @@ struct TALER_EXCHANGEDB_AgeWithdrawCommitment
   struct TALER_ExchangeSignatureP sig;
 
   /**
-   * Timestamp of the request beeing made
+   * Timestamp of the request being made
    */
   struct GNUNET_TIME_Timestamp timestamp;
 };
diff --git a/src/util/crypto_confirmation.c b/src/util/crypto_confirmation.c
index 6e5881e18..14075d431 100644
--- a/src/util/crypto_confirmation.c
+++ b/src/util/crypto_confirmation.c
@@ -217,7 +217,7 @@ TALER_build_pos_confirmation (const char *pos_key,
 {
   size_t pos_key_length = strlen (pos_key);
   void *key; /* pos_key in binary */
-  size_t key_len; /* lengh of the key */
+  size_t key_len; /* length of the key */
   char *ret;
   int dret;