diff --git a/src/gasket_core.h b/src/gasket_core.h
index 7405b6a..d81ec9b 100644
--- a/src/gasket_core.h
+++ b/src/gasket_core.h
@@ -228,7 +228,7 @@ struct gasket_coherent_buffer {
 	u8 __iomem *virt_base;
 
 	/* Physical base address. */
-	ulong phys_base;
+	dma_addr_t phys_base;
 
 	/* Length of the mapping. */
 	ulong length_bytes;