diff --git a/src/detection/memory/memory_bsd.c b/src/detection/memory/memory_bsd.c
index 086660e38..80a2c8ff1 100644
--- a/src/detection/memory/memory_bsd.c
+++ b/src/detection/memory/memory_bsd.c
@@ -11,13 +11,11 @@ const char* ffDetectMemory(FFMemoryResult* ram) {
     int32_t pagesFree = ffSysctlGetInt("vm.stats.vm.v_free_count", 0) + ffSysctlGetInt("vm.stats.vm.v_inactive_count", 0) + ffSysctlGetInt("vm.stats.vm.v_cache_count", 0);
     int64_t bytesCache = ffSysctlGetInt64("vfs.bufspace", 0);
 
-    #ifndef __DragonFly__
-    int64_t bytesArc = ffSysctlGetInt64("kstat.zfs.misc.arcstats.size", 0) - ffSysctlGetInt64("kstat.zfs.misc.arcstats.c_min", 0);
-    #else
-    int64_t bytesArc = 0;
-    #endif
+    int64_t bytesArc = ffSysctlGetInt64("kstat.zfs.misc.arcstats.size", 0);
+    if (bytesArc > 0) bytesArc -= ffSysctlGetInt64("kstat.zfs.misc.arcstats.c_min", 0);
+    if (bytesArc < 0) bytesArc = 0;
 
-    ram->bytesUsed = ram->bytesTotal - (uint64_t) pagesFree * instance.state.platform.sysinfo.pageSize - (uint64_t) bytesCache - (uint64_t) (bytesArc > 0 ? bytesArc : 0);
+    ram->bytesUsed = ram->bytesTotal - (uint64_t) pagesFree * instance.state.platform.sysinfo.pageSize - (uint64_t) bytesCache - (uint64_t) bytesArc;
 
     return NULL;
 }