diff --git a/include/linux/msi.h b/include/linux/msi.h
index 00c501979ff1ce34d85473a7ebffee2e7df8bdce..3cb15866ffbf7bbaa122b7a70a03ab70a034c318 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -557,7 +557,8 @@ enum {
 	MSI_FLAG_LEVEL_CAPABLE		= (1 << 18),
 	/* MSI-X entries must be contiguous */
 	MSI_FLAG_MSIX_CONTIGUOUS	= (1 << 19),
-
+	/* PCI/MSI-X vectors can be dynamically allocated/freed post MSI-X enable */
+	MSI_FLAG_PCI_MSIX_ALLOC_DYN	= (1 << 20),
 };
 
 /**