diff --git a/src/common/common.h b/src/common/common.h
index 3c555ac9e..b68e7bd7e 100644
--- a/src/common/common.h
+++ b/src/common/common.h
@@ -104,7 +104,7 @@ OQS_API void OQS_MEM_insecure_free(void *ptr);
 #endif
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif // __OQS_COMMON_H
diff --git a/src/common/rand.h b/src/common/rand.h
index e45b60689..3a5ab6e06 100644
--- a/src/common/rand.h
+++ b/src/common/rand.h
@@ -65,7 +65,7 @@ OQS_API void OQS_randombytes(uint8_t *random_array, size_t bytes_to_read);
 OQS_API void OQS_randombytes_nist_kat_init(const uint8_t *entropy_input, const uint8_t *personalization_string, int security_strength);
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif // __OQS_RANDOM_H
diff --git a/src/crypto/aes/aes.h b/src/crypto/aes/aes.h
index 6cb7d20ae..5cc61eb33 100644
--- a/src/crypto/aes/aes.h
+++ b/src/crypto/aes/aes.h
@@ -122,7 +122,7 @@ void OQS_AES256_ECB_enc_sch(const uint8_t *plaintext, const size_t plaintext_len
 void OQS_AES256_ECB_dec_sch(const uint8_t *ciphertext, const size_t ciphertext_len, const void *schedule, uint8_t *plaintext);
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif
diff --git a/src/crypto/sha3/sha3.h b/src/crypto/sha3/sha3.h
index dcbc9c967..5cb28af7b 100644
--- a/src/crypto/sha3/sha3.h
+++ b/src/crypto/sha3/sha3.h
@@ -367,7 +367,7 @@ void OQS_SHA3_cshake256_simple_absorb(uint64_t *state, uint16_t cstm, const uint
 void OQS_SHA3_cshake256_simple_squeezeblocks(uint8_t *output, size_t nblocks, uint64_t *state);
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif
diff --git a/src/kem/kem.h b/src/kem/kem.h
index 7a91edf87..1b4db874b 100644
--- a/src/kem/kem.h
+++ b/src/kem/kem.h
@@ -268,7 +268,7 @@ OQS_API void OQS_KEM_free(OQS_KEM *kem);
 // EDIT-WHEN-ADDING-KEM
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif // __OQS_KEM_H
diff --git a/src/sig/sig.h b/src/sig/sig.h
index 4cd91793c..3e148f4ae 100644
--- a/src/sig/sig.h
+++ b/src/sig/sig.h
@@ -236,7 +236,7 @@ OQS_API void OQS_SIG_free(OQS_SIG *sig);
 // EDIT-WHEN-ADDING-SIG
 
 #if defined(__cplusplus)
-}  // extern "C"
+} // extern "C"
 #endif
 
 #endif // __OQS_SIG_H