diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-core.c b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
index d3c1eaea..8f89e97c 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-core.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
@@ -223,7 +223,7 @@ argon2_finalize(const argon2_context *context, argon2_instance_t *instance)
 }
 
 void
-fill_memory_blocks(argon2_instance_t *instance, uint32_t pass)
+argon2_fill_memory_blocks(argon2_instance_t *instance, uint32_t pass)
 {
     argon2_position_t position;
     uint32_t l;
@@ -369,8 +369,8 @@ argon2_validate_inputs(const argon2_context *context)
     return ARGON2_OK;
 }
 
-void
-fill_first_blocks(uint8_t *blockhash, const argon2_instance_t *instance)
+static void
+argon2_fill_first_blocks(uint8_t *blockhash, const argon2_instance_t *instance)
 {
     uint32_t l;
     /* Make the first and second block in each lane as G(H0||i||0) or
@@ -511,7 +511,7 @@ argon2_initialize(argon2_instance_t *instance, argon2_context *context)
 
     /* 3. Creating first blocks, we always have at least two blocks in a slice
      */
-    fill_first_blocks(blockhash, instance);
+    argon2_fill_first_blocks(blockhash, instance);
     /* Clearing the hash */
     sodium_memzero(blockhash, ARGON2_PREHASH_SEED_LENGTH);
 
diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-core.h b/src/libsodium/crypto_pwhash/argon2/argon2-core.h
index 3abf6f33..ccad1355 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-core.h
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-core.h
@@ -216,14 +216,6 @@ static uint32_t index_alpha(const argon2_instance_t *instance,
  */
 int argon2_validate_inputs(const argon2_context *context);
 
-/*
- * Function creates first 2 blocks per lane
- * @param instance Pointer to the current instance
- * @param blockhash Pointer to the pre-hashing digest
- * @pre blockhash must point to @a PREHASH_SEED_LENGTH allocated values
- */
-void fill_first_blocks(uint8_t *blockhash, const argon2_instance_t *instance);
-
 /*
  * Function allocates memory, hashes the inputs with Blake,  and creates first
  * two blocks. Returns the pointer to the main memory with 2 blocks per lane
@@ -275,6 +267,6 @@ void argon2_fill_segment_ref(const argon2_instance_t *instance,
  * @param instance Pointer to the current instance
  * @return Zero if successful, -1 if memory failed to allocate
  */
-void fill_memory_blocks(argon2_instance_t *instance, uint32_t pass);
+void argon2_fill_memory_blocks(argon2_instance_t *instance, uint32_t pass);
 
 #endif
diff --git a/src/libsodium/crypto_pwhash/argon2/argon2.c b/src/libsodium/crypto_pwhash/argon2/argon2.c
index ba075a28..b3bee574 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2.c
@@ -73,7 +73,7 @@ argon2_ctx(argon2_context *context, argon2_type type)
 
     /* 4. Filling memory */
     for (pass = 0; pass < instance.passes; pass++) {
-        fill_memory_blocks(&instance, pass);
+        argon2_fill_memory_blocks(&instance, pass);
     }
 
     /* 5. Finalization */