diff --git a/src/args.c b/src/args.c
index be74e1e..7837ba6 100644
--- a/src/args.c
+++ b/src/args.c
@@ -55,6 +55,8 @@ const char *TYPE_STR[] = {
 };
 
 const size_t NARGS = sizeof(ARGS) / sizeof(ARGS[0]);
+
+static
 ArgMeta arg_meta(char arg) {
     for (size_t ii = 0; ii < NARGS; ii += 1) {
         ArgMeta meta = ARGS[ii];
diff --git a/src/bytevec.c b/src/bytevec.c
index 0d87620..2002b76 100644
--- a/src/bytevec.c
+++ b/src/bytevec.c
@@ -6,6 +6,7 @@ typedef struct ByteVec_s {
     size_t len;
 } ByteVec;
 
+static
 AsmError ensure_push(ByteVec *vec, size_t el_size, size_t extra) {
     if (vec->len + extra < vec->len) {
         return ErrOutOfMemory;
diff --git a/src/hash.c b/src/hash.c
index 21d1d0f..f136cdc 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -5,6 +5,7 @@ typedef struct InstHtNode_s {
 } InstHtNode;
 typedef InstHtNode *InstHt;
 
+static
 uint32_t inst_hash(const char *s, size_t len) {
     uint32_t hash = 0;
     uint32_t mul = 75;
@@ -15,6 +16,7 @@ uint32_t inst_hash(const char *s, size_t len) {
     return hash;
 }
 
+static
 InstHt build_lookup(void) {
     const size_t size = 256;
     InstHt table = (InstHt)malloc(size * sizeof(InstHtNode));
@@ -40,6 +42,7 @@ InstHt build_lookup(void) {
     return table;
 }
 
+static
 size_t inst_lookup(InstHt ht, const char *s, size_t len) {
     uint32_t hash = inst_hash(s, len);
     uint8_t *node = (uint8_t *)&ht[(size_t)(hash & 0xff)];
diff --git a/src/hbas.c b/src/hbas.c
index 2ccdba2..038419d 100644
--- a/src/hbas.c
+++ b/src/hbas.c
@@ -174,9 +174,11 @@ AsmError push_int_le(char *buf, uint64_t val, size_t size, uint8_t sign) {
         buf[ii] = val & 0xff;
         val >>= 8;
     }
+
     return ErrOk;
 }
 
+static
 AsmError assemble_instr(InstHt ht, char *input, size_t len, Token *tok,
                         ByteVec *rv, HoleVec *holes) {
     const InstDesc *inst;
diff --git a/src/register.c b/src/register.c
index b393d8b..9b2cd69 100644
--- a/src/register.c
+++ b/src/register.c
@@ -1,3 +1,4 @@
+static
 int parse_register(char *name, size_t len) {
     if (name[0] != 'r') {
         return 256;  // Register name should start with 'r'
diff --git a/src/token.c b/src/token.c
index c8bf3ae..8612073 100644
--- a/src/token.c
+++ b/src/token.c
@@ -18,6 +18,7 @@ typedef struct Token_s {
     uint64_t num;
 } Token;
 
+static
 Token token_ident(char *input, size_t len, size_t pos) {
     size_t start = pos;
     while (pos < len) {
@@ -33,6 +34,7 @@ Token token_ident(char *input, size_t len, size_t pos) {
     return (Token){TokIdent, start, pos - start, 0};
 }
 
+static
 Token token_number(char *input, size_t len, size_t pos) {
     char *ptr = &input[pos];
     char next = '\0';
@@ -109,6 +111,7 @@ Token token_number(char *input, size_t len, size_t pos) {
     }
 }
 
+static
 Token token(char *input, size_t len, size_t pos) {
     char chr, chru;
     char *ptr = &input[pos];