diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c
index 0c2418a..f52091b 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c
@@ -23,6 +23,11 @@
 #include <timer.h>
 #include <timestamp.h>
 #include <baseboard/variants.h>
+#include <soc/pci_devs.h>
+
+#define SD_CAP_BYP		0x810
+#define  SD_CAP_BYP_EN		0x5A
+#define SD_CAP_BYP_REG1		0x814
 
 void variant_mainboard_final(void)
 {
@@ -36,6 +41,21 @@
 		cmd |= PCI_COMMAND_MASTER;
 		pci_write_config16(dev, PCI_COMMAND, cmd);
 	}
+
+	/* Reduce SD-Card speed to DDR50 because of PCB constraints. */
+	dev = pcidev_path_on_root(PCH_DEVFN_SDCARD);
+	if (dev) {
+		uint32_t reg;
+		struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0);
+		if (!res)
+			return;
+
+		write32(res2mmio(res, SD_CAP_BYP, 0), SD_CAP_BYP_EN);
+		reg = read32(res2mmio(res, SD_CAP_BYP_REG1, 0));
+		/* Disable HS400 and SDR104, keep SDR50 and DDR50 modes. */
+		reg &= ~0x20005800;
+		write32(res2mmio(res, SD_CAP_BYP_REG1, 0), reg);
+	}
 }
 
 static void wait_for_legacy_dev(void *unused)