diff --git a/source/arm9/dev.c b/source/arm9/dev.c
index ccd73d3..3babe18 100644
--- a/source/arm9/dev.c
+++ b/source/arm9/dev.c
@@ -128,7 +128,7 @@
 
 		if(!sdmmc_sd_is_active())
 		{
-			TIMER_sleep(300); // Wait until the SD bus times out
+			TIMER_sleep(255); // Wait until the SD bus times out. 253 ms works. 255 for safety.
 			if(!sdmmc_sd_is_active()) return false; // Check again if a SD card is inserted
 		}