diff --git a/src/bin/df.cpp b/src/bin/df.cpp
index efb6e5583b..d7e66e9eb2 100644
--- a/src/bin/df.cpp
+++ b/src/bin/df.cpp
@@ -207,6 +207,9 @@ main(int argc, char **argv)
 					case 'b':
 						showBlocks = true;
 						break;
+					case 'h':
+						// human readable units in Unix df
+						break;
 					default:
 						ShowUsage(programName);
 				}