diff --git a/bindings/perl/Sigar.pm b/bindings/perl/Sigar.pm
index 452095fc..76b66aa1 100644
--- a/bindings/perl/Sigar.pm
+++ b/bindings/perl/Sigar.pm
@@ -40,27 +40,5 @@ else {
 
 sub NULL_HWADDR() { "00:00:00:00:00:00" }
 
-sub IFF_UP() { 0x1 }
-
-sub IFF_BROADCAST() { 0x2 }
-
-sub IFF_DEBUG() { 0x4 }
-
-sub IFF_LOOPBACK() { 0x8 }
-
-sub IFF_POINTOPOINT() { 0x10 }
-
-sub IFF_NOTRAILERS() { 0x20 }
-
-sub IFF_RUNNING() { 0x40 }
-
-sub IFF_NOARP() { 0x80 }
-
-sub IFF_PROMISC() { 0x100 }
-
-sub IFF_ALLMULTI() { 0x200 }
-
-sub IFF_MULTICAST() { 0x800 }
-
 1;
 __END__
diff --git a/bindings/perl/Sigar.xs b/bindings/perl/Sigar.xs
index a1e892ca..872c37c9 100644
--- a/bindings/perl/Sigar.xs
+++ b/bindings/perl/Sigar.xs
@@ -134,12 +134,34 @@ static int proc_env_getvalue(void *data,
     return SIGAR_OK;
 }
 
+#define XS_SIGAR_CONST_IV(name) \
+    (void)newCONSTSUB(stash, #name, newSViv(SIGAR_##name))
+
+static void boot_Sigar_constants(pTHX)
+{
+    HV *stash = gv_stashpv("Sigar", TRUE);
+    XS_SIGAR_CONST_IV(IFF_UP);
+    XS_SIGAR_CONST_IV(IFF_BROADCAST);
+    XS_SIGAR_CONST_IV(IFF_DEBUG);
+    XS_SIGAR_CONST_IV(IFF_LOOPBACK);
+    XS_SIGAR_CONST_IV(IFF_POINTOPOINT);
+    XS_SIGAR_CONST_IV(IFF_NOTRAILERS);
+    XS_SIGAR_CONST_IV(IFF_RUNNING);
+    XS_SIGAR_CONST_IV(IFF_NOARP);
+    XS_SIGAR_CONST_IV(IFF_PROMISC);
+    XS_SIGAR_CONST_IV(IFF_ALLMULTI);
+    XS_SIGAR_CONST_IV(IFF_MULTICAST);
+}
+
 MODULE = Sigar   PACKAGE = Sigar
 
 PROTOTYPES: disable
 
 INCLUDE: Sigar_generated.xs
 
+BOOT:
+    boot_Sigar_constants(aTHX);
+
 MODULE = Sigar   PACKAGE = Sigar   PREFIX = sigar_
 
 Sigar