diff --git a/sources/mmc.c b/sources/mmc.c
index d24d74c..6fe2ec9 100644
--- a/sources/mmc.c
+++ b/sources/mmc.c
@@ -54,7 +54,7 @@
 #endif
 
 
-#define FCLK_FAST() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
+#define SPICLK_FAST() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
 					  MCF_DSPI_DCTAR_PCSSCK(0b01) |	/* 3 clock DSPICS to DSPISCK delay prescaler */ \
 					  MCF_DSPI_DCTAR_PASC_3CLK |	/* 3 clock DSPISCK to DSPICS negation prescaler */ \
 					  MCF_DSPI_DCTAR_PDT_3CLK |		/* 3 clock delay between DSPICS assertions prescaler */ \
@@ -63,7 +63,7 @@
 					  MCF_DSPI_DCTAR_DT(0b1001) |	/* 1024 */ \
 					  MCF_DSPI_DCTAR_BR(0b0000); }
 
-#define FCLK_SLOW() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
+#define SPICLK_SLOW() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) |	/* transfer size = 8 bit */ \
 					  MCF_DSPI_DCTAR_PCSSCK(0b01) |	/* 3 clock DSPICS to DSPISCK delay prescaler */ \
 					  MCF_DSPI_DCTAR_PASC_3CLK |	/* 3 clock DSPISCK to DSPICS negation prescaler */ \
 					  MCF_DSPI_DCTAR_PDT_3CLK |		/* 3 clock delay between DSPICS assertions prescaler */ \
@@ -392,7 +392,7 @@ DSTATUS disk_initialize(uint8_t drv)
 
 	if (Stat & STA_NODISK) return Stat;	/* Is card existing in the socket? */
 
-	FCLK_SLOW();
+	SPICLK_SLOW();
 	for (n = 10; n; n--) xchg_spi(0xFF);	/* Send 80 dummy clocks */
 
 	ty = 0;
@@ -423,7 +423,7 @@ DSTATUS disk_initialize(uint8_t drv)
 	deselect();
 
 	if (ty) {			/* OK */
-		FCLK_FAST();			/* Set fast clock */
+		SPICLK_FAST();			/* Set fast clock */
 		Stat &= ~STA_NOINIT;	/* Clear STA_NOINIT flag */
 	} else {			/* Failed */
 		power_off();