diff --git a/src/freebsd/btop_collect.cpp b/src/freebsd/btop_collect.cpp
index 29e54bf2b..86625590b 100644
--- a/src/freebsd/btop_collect.cpp
+++ b/src/freebsd/btop_collect.cpp
@@ -586,7 +586,7 @@ namespace Mem {
 		// this code is for ZFS mounts
 		for (const auto &poolName : Mem::zpools) {
 			char sysCtl[1024];
-			snprintf(sysCtl, sizeof(sysCtl), "sysctl kstat.zfs.%s.dataset | egrep \'dataset_name|nread|nwritten\'", poolName.c_str());
+			snprintf(sysCtl, sizeof(sysCtl), "sysctl kstat.zfs.%s.dataset | grep -E \'dataset_name|nread|nwritten\'", poolName.c_str());
 			PipeWrapper f = PipeWrapper(sysCtl, "r");
 			if (f()) {
 				char buf[512];