diff --git a/src/qt/messagemodel.cpp b/src/qt/messagemodel.cpp
index f0005901..357b99c2 100644
--- a/src/qt/messagemodel.cpp
+++ b/src/qt/messagemodel.cpp
@@ -328,7 +328,7 @@ class MessageTablePriv
             
             return FailedErrorShown;
         };
-         // Add addresses / update labels that we've sent to to the address book
+         // Add addresses / update labels that we've sent to the address book
         std::string strAddress = rcp.address.toStdString();
         CTxDestination dest = CDarkSilkAddress(strAddress).Get();
         std::string strLabel = rcp.label.toStdString();
diff --git a/src/secp256k1/src/modinv32_impl.h b/src/secp256k1/src/modinv32_impl.h
index 8e400b69..2b23ebf1 100644
--- a/src/secp256k1/src/modinv32_impl.h
+++ b/src/secp256k1/src/modinv32_impl.h
@@ -80,7 +80,7 @@ static void secp256k1_modinv32_normalize_30(secp256k1_modinv32_signed30 *r, int3
     /* In a first step, add the modulus if the input is negative, and then negate if requested.
      * This brings r from range (-2*modulus,modulus) to range (-modulus,modulus). As all input
      * limbs are in range (-2^30,2^30), this cannot overflow an int32_t. Note that the right
-     * shifts below are signed sign-extending shifts (see assumptions.h for tests that that is
+     * shifts below are signed sign-extending shifts (see assumptions.h for tests that is
      * indeed the behavior of the right shift operator). */
     cond_add = r8 >> 31;
     r0 += modinfo->modulus.v[0] & cond_add;
diff --git a/src/secp256k1/src/modinv64_impl.h b/src/secp256k1/src/modinv64_impl.h
index e33727d3..1275d372 100644
--- a/src/secp256k1/src/modinv64_impl.h
+++ b/src/secp256k1/src/modinv64_impl.h
@@ -104,7 +104,7 @@ static void secp256k1_modinv64_normalize_62(secp256k1_modinv64_signed62 *r, int6
     /* In a first step, add the modulus if the input is negative, and then negate if requested.
      * This brings r from range (-2*modulus,modulus) to range (-modulus,modulus). As all input
      * limbs are in range (-2^62,2^62), this cannot overflow an int64_t. Note that the right
-     * shifts below are signed sign-extending shifts (see assumptions.h for tests that that is
+     * shifts below are signed sign-extending shifts (see assumptions.h for tests that is
      * indeed the behavior of the right shift operator). */
     cond_add = r4 >> 63;
     r0 += modinfo->modulus.v[0] & cond_add;
diff --git a/src/secp256k1/src/secp256k1.c b/src/secp256k1/src/secp256k1.c
index 7af333ca..4b488c47 100644
--- a/src/secp256k1/src/secp256k1.c
+++ b/src/secp256k1/src/secp256k1.c
@@ -526,7 +526,7 @@ static int secp256k1_ecdsa_sign_inner(const secp256k1_context* ctx, secp256k1_sc
             break;
         }
         is_nonce_valid = secp256k1_scalar_set_b32_seckey(&non, nonce32);
-        /* The nonce is still secret here, but it being invalid is is less likely than 1:2^255. */
+        /* The nonce is still secret here, but it being invalid is less likely than 1:2^255. */
         secp256k1_declassify(ctx, &is_nonce_valid, sizeof(is_nonce_valid));
         if (is_nonce_valid) {
             ret = secp256k1_ecdsa_sig_sign(&ctx->ecmult_gen_ctx, r, s, &sec, &msg, &non, recid);