diff --git a/litex/soc/software/liblitesdcard/sdcard.c b/litex/soc/software/liblitesdcard/sdcard.c
index 1a2929700..9c2a56228 100644
--- a/litex/soc/software/liblitesdcard/sdcard.c
+++ b/litex/soc/software/liblitesdcard/sdcard.c
@@ -26,7 +26,7 @@
 #endif
 
 #ifndef SDCARD_CLK_FREQ
-#define SDCARD_CLK_FREQ 50000000
+#define SDCARD_CLK_FREQ 25000000
 #endif
 
 unsigned int sdcard_response[SD_CMD_RESPONSE_SIZE/4];