diff --git a/nixos/modules/installer/tools/nixos-generate-config.pl b/nixos/modules/installer/tools/nixos-generate-config.pl
index 19656c9b9ea..c590c4cde3f 100644
--- a/nixos/modules/installer/tools/nixos-generate-config.pl
+++ b/nixos/modules/installer/tools/nixos-generate-config.pl
@@ -233,8 +233,8 @@ foreach my $path (glob "/sys/bus/usb/devices/*") {
 }
 
 
-# Add the modules for all block devices.
-foreach my $path (glob "/sys/class/block/*") {
+# Add the modules for all block and MMC devices.
+foreach my $path (glob "/sys/class/{block,mmc_host}/*") {
     my $module;
     if (-e "$path/device/driver/module") {
         $module = basename `readlink -f $path/device/driver/module`;