diff --git a/repos/os/src/drivers/ahci/spec/x86/platform.cc b/repos/os/src/drivers/ahci/spec/x86/platform.cc
index 58acd9203..ea169334b 100644
--- a/repos/os/src/drivers/ahci/spec/x86/platform.cc
+++ b/repos/os/src/drivers/ahci/spec/x86/platform.cc
@@ -63,9 +63,9 @@ struct X86_hba : Platform::Hba
 		res_base = resource.base();
 		res_size = resource.size();
 
-		/* enable bus master */
 		uint16_t cmd = pci_device->config_read(PCI_CMD, Platform::Device::ACCESS_16BIT);
-		cmd |= 0x4;
+		cmd |= 0x2; /* respond to memory space accesses */
+		cmd |= 0x4; /* enable bus master */
 		_config_write(PCI_CMD, cmd, Platform::Device::ACCESS_16BIT);
 
 		irq.construct(pci_device->irq(0));