diff --git a/headers/posix/sys/resource.h b/headers/posix/sys/resource.h
index d9d9e75093..05dbba4770 100644
--- a/headers/posix/sys/resource.h
+++ b/headers/posix/sys/resource.h
@@ -25,6 +25,10 @@ struct rlimit {
 #define RLIMIT_NOFILE	4	/* number of open files */
 #define RLIMIT_STACK	5	/* stack size */
 #define RLIMIT_AS		6	/* address space size */
+/* Haiku-specifics */
+#define RLIMIT_NOVMON	7	/* number of open vnode monitors */
+
+#define	RLIM_NLIMITS	8	/* number of resource limits */
 
 #define RLIM_INFINITY	(0xffffffffUL)
 #define RLIM_SAVED_MAX	RLIM_INFINITY
diff --git a/src/system/libroot/os/arch/x86/compatibility.c b/src/system/libroot/os/arch/x86/compatibility.c
index 766ce1dde8..99bf544a52 100644
--- a/src/system/libroot/os/arch/x86/compatibility.c
+++ b/src/system/libroot/os/arch/x86/compatibility.c
@@ -10,7 +10,9 @@
 
 #include <SupportDefs.h>
 
+#include <sys/resource.h>
 #include <syscalls.h>
+#include <errno.h>
 
 
 int _kset_mon_limit_(int num);
@@ -23,14 +25,26 @@ int _kset_cpu_state_(int cpuNum, int state);
 int
 _kset_mon_limit_(int num)
 {
-	return B_ERROR;
+	struct rlimit rl;
+	if (num < 1)
+		return EINVAL;
+	rl.rlim_cur = num;
+	if (setrlimit(RLIMIT_NOVMON, &rl) < 0)
+		return errno;
+	return B_OK;
 }
 
 
 int
 _kset_fd_limit_(int num)
 {
-	return B_ERROR;
+	struct rlimit rl;
+	if (num < 1)
+		return EINVAL;
+	rl.rlim_cur = num;
+	if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
+		return errno;
+	return B_OK;
 }