diff --git a/sw/bootloader/hal/include/twi_flash.h b/sw/bootloader/hal/include/twi_flash.h
index 7a9eadca..f9fd69d6 100644
--- a/sw/bootloader/hal/include/twi_flash.h
+++ b/sw/bootloader/hal/include/twi_flash.h
@@ -18,21 +18,6 @@
 
 int twi_flash_read_word(uint32_t addr, uint32_t* rdata);
 int twi_flash_write_word(uint32_t addr, uint32_t wdata);
-
-/**
-* @brief Keeps TWI Peripheral in IDLE for 'tick_count' TWI clock ticks
-*
-* @param tick_count Amount of TWI NOP ticks to wait
-*
-*/
-inline void __attribute__ ((always_inline)) twi_flash_delay_twi_tick(int tick_count){
-
-  for(int i = 0; i < tick_count; i++)
-  {
-    while (NEORV32_TWI->CTRL & (1<<TWI_CTRL_TX_FULL)); // wait for free TX entry
-    NEORV32_TWI->DCMD = (uint32_t)(TWI_CMD_NOP << TWI_DCMD_CMD_LO); // IDLE for 1 twi tick
-  }
-  while (NEORV32_TWI->CTRL & (1 << TWI_CTRL_BUSY)); // wait until FIFO empty
-}
+void twi_flash_delay_twi_tick(int tick_count);
 
 #endif // TWI_FLASH_H
diff --git a/sw/bootloader/hal/source/twi_flash.c b/sw/bootloader/hal/source/twi_flash.c
index 998ba657..d7a41374 100644
--- a/sw/bootloader/hal/source/twi_flash.c
+++ b/sw/bootloader/hal/source/twi_flash.c
@@ -226,3 +226,19 @@ int twi_flash_write_word(uint32_t addr, uint32_t wdata) {
   return 1;
 #endif
 }
+
+/**
+* @brief Keeps TWI Peripheral in IDLE for 'tick_count' TWI clock ticks
+*
+* @param tick_count Amount of TWI NOP ticks to wait
+*
+*/
+void twi_flash_delay_twi_tick(int tick_count){
+
+  for(int i = 0; i < tick_count; i++)
+  {
+    while (NEORV32_TWI->CTRL & (1<<TWI_CTRL_TX_FULL)); // wait for free TX entry
+    NEORV32_TWI->DCMD = (uint32_t)(TWI_CMD_NOP << TWI_DCMD_CMD_LO); // IDLE for 1 twi tick
+  }
+  while (NEORV32_TWI->CTRL & (1 << TWI_CTRL_BUSY)); // wait until FIFO empty
+}