diff --git a/avr/usbload/mmc.c b/avr/usbload/mmc.c
index 3c1036b..a2bdcd5 100644
--- a/avr/usbload/mmc.c
+++ b/avr/usbload/mmc.c
@@ -26,7 +26,7 @@ uint8_t mmc_init()
     uint8_t CMD[] = { 0x40, 0x00, 0x00, 0x00, 0x00, 0x95 };
     while (mmc_write_command(CMD) != 1) {
         if (Timeout++ > 20) {
-            MMC_Disable();
+            mmc_disable();
             return (1);         // Abbruch bei Commando1 (Return Code1)
         }
     }
@@ -37,7 +37,7 @@ uint8_t mmc_init()
     CMD[5] = 0xFF;
     while (mmc_write_command(CMD) != 0) {
         if (Timeout++ > 800) {
-            MMC_Disable();
+            mmc_disable();
             return (9);         // Abbruch bei Commando2 (Return Code2)
         }
     }
diff --git a/avr/usbload/mmc.h b/avr/usbload/mmc.h
index 629fdb9..d46599d 100644
--- a/avr/usbload/mmc.h
+++ b/avr/usbload/mmc.h
@@ -22,11 +22,9 @@ extern uint8_t mmc_write_command(uint8_t *);
 extern uint8_t mmc_read_csd(uint8_t *);
 extern uint8_t mmc_read_cid(uint8_t *);
 
-    // set MMC_Chip_Select to high (MMC/SD-Karte Inaktiv)
-#define MMC_Disable() MMC_WRITE|= (1<<MMC_CS);
+#define mmc_disable() MMC_WRITE|= (1<<MMC_CS);
 
-    // set MMC_Chip_Select to low (MMC/SD-Karte Aktiv)
-#define MMC_Enable() MMC_WRITE&=~(1<<MMC_CS);
+#define mmc_enable() MMC_WRITE&=~(1<<MMC_CS);
 
 #define nop()  __asm__ __volatile__ ("nop" ::)