diff --git a/armsrc/desfire_crypto.c b/armsrc/desfire_crypto.c
index db543bbe6..cafa98de1 100644
--- a/armsrc/desfire_crypto.c
+++ b/armsrc/desfire_crypto.c
@@ -46,9 +46,9 @@ static mbedtls_des_context ctx;
 static mbedtls_des3_context ctx3;
 static mbedtls_aes_context actx;
 
-static inline void update_key_schedules(desfirekey_t key);
+static void update_key_schedules(desfirekey_t key);
 
-static inline void update_key_schedules(desfirekey_t key) {
+static void update_key_schedules(desfirekey_t key) {
     // DES_set_key ((DES_cblock *)key->data, &(key->ks1));
     // DES_set_key ((DES_cblock *)(key->data + 8), &(key->ks2));
     // if (T_3K3DES == key->type) {
diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c
index 14298a5f1..21b0c0a42 100644
--- a/armsrc/legicrf.c
+++ b/armsrc/legicrf.c
@@ -64,8 +64,7 @@ static uint32_t last_frame_end; /* ts of last bit of previews rx or tx frame */
 //-----------------------------------------------------------------------------
 // I/O interface abstraction (FPGA -> ARM)
 //-----------------------------------------------------------------------------
-
-static inline uint8_t rx_byte_from_fpga(void) {
+static uint8_t rx_byte_from_fpga(void) {
     for (;;) {
         WDT_HIT();
 
@@ -93,11 +92,7 @@ static inline uint8_t rx_byte_from_fpga(void) {
 // Note: The SSC receiver is never synchronized the calculation may be performed
 // on a i/q pair from two subsequent correlations, but does not matter.
 // Note: inlining this function would fail with -Os
-#ifdef __OPTIMIZE_SIZE__
 static int32_t sample_power(void) {
-#else
-static inline int32_t sample_power(void) {
-#endif
     int32_t q = (int8_t)rx_byte_from_fpga();
     q = ABS(q);
     int32_t i = (int8_t)rx_byte_from_fpga();
@@ -115,11 +110,7 @@ static inline int32_t sample_power(void) {
 // has a delay loop that aligns rx_bit calls to the TAG tx timeslots.
 
 // Note: inlining this function would fail with -Os
-#ifdef __OPTIMIZE_SIZE__
 static bool rx_bit(void) {
-#else
-static inline bool rx_bit(void) {
-#endif
     int32_t power;
 
     for (size_t i = 0; i < 5; ++i) {
@@ -138,7 +129,7 @@ static inline bool rx_bit(void) {
 // be circumvented, but the adventage over bitbang would be little.
 //-----------------------------------------------------------------------------
 
-static inline void tx_bit(bool bit) {
+static void tx_bit(bool bit) {
     // insert pause
     LOW(GPIO_SSC_DOUT);
     last_frame_end += RWD_TIME_PAUSE;
diff --git a/armsrc/legicrfsim.c b/armsrc/legicrfsim.c
index e2b06ba9b..35eefc56c 100644
--- a/armsrc/legicrfsim.c
+++ b/armsrc/legicrfsim.c
@@ -66,11 +66,7 @@ static uint32_t last_frame_end; /* ts of last bit of previews rx or tx frame */
 
 // Returns true if a pulse/pause is received within timeout
 // Note: inlining this function would fail with -Os
-#ifdef __OPTIMIZE_SIZE__
 static bool wait_for(bool value, const uint32_t timeout) {
-#else
-static inline bool wait_for(bool value, const uint32_t timeout) {
-#endif
     while ((bool)(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN) != value) {
         if (GetCountSspClk() > timeout) {
             return false;
@@ -88,7 +84,7 @@ static inline bool wait_for(bool value, const uint32_t timeout) {
 //  - A bit length >80.2us is a 1
 //  - A bit length <80.2us is a 0
 //  - A bit length >148.6us is a code violation
-static inline int8_t rx_bit(void) {
+static int8_t rx_bit(void) {
     // backup ts for threshold calculation
     uint32_t bit_start = last_frame_end;
 
@@ -132,11 +128,7 @@ static inline int8_t rx_bit(void) {
 //       not mandatory but results in a cleaner signal. tx_frame will disable
 //       the subcarrier when the frame is done.
 // Note: inlining this function would fail with -Os
-#ifdef __OPTIMIZE_SIZE__
 static void tx_bit(bool bit) {
-#else
-static inline void tx_bit(bool bit) {
-#endif
     LED_C_ON();
 
     if (bit) {
diff --git a/armsrc/nprintf.c b/armsrc/nprintf.c
index 645454b4e..1ce3842d3 100644
--- a/armsrc/nprintf.c
+++ b/armsrc/nprintf.c
@@ -127,7 +127,7 @@ typedef struct {
 
 
 // internal buffer output
-static inline void _out_buffer(char character, void *buffer, size_t idx, size_t maxlen) {
+static void _out_buffer(char character, void *buffer, size_t idx, size_t maxlen) {
     if (idx < maxlen) {
         ((char *)buffer)[idx] = character;
     }
@@ -135,7 +135,7 @@ static inline void _out_buffer(char character, void *buffer, size_t idx, size_t
 
 
 // internal null output
-static inline void _out_null(char character, void *buffer, size_t idx, size_t maxlen) {
+static void _out_null(char character, void *buffer, size_t idx, size_t maxlen) {
     (void)character;
     (void)buffer;
     (void)idx;
@@ -144,7 +144,7 @@ static inline void _out_null(char character, void *buffer, size_t idx, size_t ma
 
 
 // internal _putchar wrapper
-static inline void _out_char(char character, void *buffer, size_t idx, size_t maxlen) {
+static void _out_char(char character, void *buffer, size_t idx, size_t maxlen) {
     (void)buffer;
     (void)idx;
     (void)maxlen;
@@ -155,7 +155,7 @@ static inline void _out_char(char character, void *buffer, size_t idx, size_t ma
 
 
 // internal output function wrapper
-static inline void _out_fct(char character, void *buffer, size_t idx, size_t maxlen) {
+static void _out_fct(char character, void *buffer, size_t idx, size_t maxlen) {
     (void)idx;
     (void)maxlen;
     if (character) {
@@ -167,7 +167,7 @@ static inline void _out_fct(char character, void *buffer, size_t idx, size_t max
 
 // internal secure strlen
 // \return The length of the string (excluding the terminating 0) limited by 'maxsize'
-static inline unsigned int _strnlen_s(const char *str, size_t maxsize) {
+static unsigned int _strnlen_s(const char *str, size_t maxsize) {
     const char *s;
     for (s = str; *s && maxsize--; ++s);
     return (unsigned int)(s - str);
@@ -176,7 +176,7 @@ static inline unsigned int _strnlen_s(const char *str, size_t maxsize) {
 
 // internal test if char is a digit (0-9)
 // \return true if char is a digit
-static inline bool _is_digit(char ch) {
+static bool _is_digit(char ch) {
     return (ch >= '0') && (ch <= '9');
 }