diff --git a/Userland/Utilities/du.cpp b/Userland/Utilities/du.cpp
index d018e79d5af..5de11b6db43 100644
--- a/Userland/Utilities/du.cpp
+++ b/Userland/Utilities/du.cpp
@@ -26,6 +26,7 @@ struct DuOption {
     };
 
     bool human_readable = false;
+    bool human_readable_si = false;
     bool all = false;
     bool apparent_size = false;
     i64 threshold = 0;
@@ -97,6 +98,7 @@ ErrorOr<void> parse_args(Main::Arguments arguments, Vector<DeprecatedString>& fi
     args_parser.add_option(du_option.all, "Write counts for all files, not just directories", "all", 'a');
     args_parser.add_option(du_option.apparent_size, "Print apparent sizes, rather than disk usage", "apparent-size", 0);
     args_parser.add_option(du_option.human_readable, "Print human-readable sizes", "human-readable", 'h');
+    args_parser.add_option(du_option.human_readable_si, "Print human-readable sizes in SI units", "si", 0);
     args_parser.add_option(du_option.max_depth, "Print the total for a directory or file only if it is N or fewer levels below the command line argument", "max-depth", 'd', "N");
     args_parser.add_option(summarize, "Display only a total for each argument", "summarize", 's');
     args_parser.add_option(du_option.threshold, "Exclude entries smaller than size if positive, or entries greater than size if negative", "threshold", 't', "size");
@@ -174,6 +176,8 @@ ErrorOr<u64> print_space_usage(DeprecatedString const& path, DuOption const& du_
 
     if (du_option.human_readable) {
         out("{}", human_readable_size(size));
+    } else if (du_option.human_readable_si) {
+        out("{}", human_readable_size(size, AK::HumanReadableBasedOn::Base10));
     } else {
         out("{}", ceil_div(size, du_option.block_size));
     }