diff --git a/lib/System/Unix/Process.inc b/lib/System/Unix/Process.inc
index 94e4c1bde25..911b8c32581 100644
--- a/lib/System/Unix/Process.inc
+++ b/lib/System/Unix/Process.inc
@@ -18,7 +18,9 @@
 #ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
 #endif
-#ifdef HAVE_MALLOC_H
+// DragonFly BSD has deprecated <malloc.h> for <stdlib.h> instead,
+//  Unix.h includes this for us already.
+#if defined(HAVE_MALLOC_H) && !defined(__DragonFly__)
 #include <malloc.h>
 #endif
 #ifdef HAVE_MALLOC_MALLOC_H