diff --git a/radio/src/targets/common/arm/stm32/sdio_sd.c b/radio/src/targets/common/arm/stm32/sdio_sd.c
index 83980ab64..f0f97b97f 100644
--- a/radio/src/targets/common/arm/stm32/sdio_sd.c
+++ b/radio/src/targets/common/arm/stm32/sdio_sd.c
@@ -1107,7 +1107,7 @@ OPTIMIZE("O0") SD_Error SD_WaitReadOperation(uint32_t timeout)
     delay_ms(1);
     timeout--;
   }
-#ifndef BOOT
+#if !defined(BOOT)
   TRACE_SD_CARD_EVENT((timeout == 0), sd_wait_read, (TransferError << 8) + (DMAEndOfTransfer << 1) + TransferEnd);
 #endif  
 
@@ -1119,7 +1119,7 @@ OPTIMIZE("O0") SD_Error SD_WaitReadOperation(uint32_t timeout)
     delay_ms(1);
     timeout--;
   }
-#ifndef BOOT
+#if !defined(BOOT)
   TRACE_SD_CARD_EVENT((timeout == 0), sd_wait_read, -1);
 #endif  
 
@@ -1336,7 +1336,7 @@ OPTIMIZE("O0") SD_Error SD_WaitWriteOperation(uint32_t timeout)
     delay_ms(1);
     timeout--;
   }
-#ifndef BOOT
+#if !defined(BOOT)
   TRACE_SD_CARD_EVENT((timeout == 0), sd_wait_write, (TransferError << 8) + (DMAEndOfTransfer << 1) + TransferEnd);
 #endif
   
@@ -1348,7 +1348,7 @@ OPTIMIZE("O0") SD_Error SD_WaitWriteOperation(uint32_t timeout)
     delay_ms(1);
     timeout--;
   }
-#ifndef BOOT
+#if !defined(BOOT)
   TRACE_SD_CARD_EVENT((timeout == 0), sd_wait_write, -1);
 #endif  
 
@@ -1482,7 +1482,7 @@ OPTIMIZE("O0") void SD_ProcessIRQ(void)
                 SDIO_IT_TXFIFOHE | SDIO_IT_RXFIFOHF | SDIO_IT_TXUNDERR |
                 SDIO_IT_RXOVERR | SDIO_IT_STBITERR, DISABLE);
 
-#ifndef BOOT
+#if !defined(BOOT)
   TRACE_SD_CARD_EVENT((TransferError != SD_OK), sd_irq, TransferError);
 #endif  
 }