diff --git a/libraries/plugins/uio/dfl.c b/libraries/plugins/uio/dfl.c
index 985938500cb8..c6b433602685 100644
--- a/libraries/plugins/uio/dfl.c
+++ b/libraries/plugins/uio/dfl.c
@@ -31,6 +31,10 @@
 #include <time.h>
 #include <sys/pci.h>
 
+#ifndef PCI_STD_NUM_BARS
+#define PCI_STD_NUM_BARS 6
+#endif // PCI_STD_NUM_BARS
+
 #include "opae_int.h"
 #include "opae_uio.h"
 #include "dfl.h"
diff --git a/libraries/plugins/vfio/dfl.c b/libraries/plugins/vfio/dfl.c
index e0b4a951cf33..70f12f214d23 100644
--- a/libraries/plugins/vfio/dfl.c
+++ b/libraries/plugins/vfio/dfl.c
@@ -31,6 +31,10 @@
 #include <time.h>
 #include <sys/pci.h>
 
+#ifndef PCI_STD_NUM_BARS
+#define PCI_STD_NUM_BARS 6
+#endif // PCI_STD_NUM_BARS
+
 #include "opae_int.h"
 #include "opae_vfio.h"
 #include "dfl.h"