diff --git a/lib/libspl/include/sys/uio.h b/lib/libspl/include/sys/uio.h
index 2cb0107d58f5..16749fa492e5 100644
--- a/lib/libspl/include/sys/uio.h
+++ b/lib/libspl/include/sys/uio.h
@@ -92,20 +92,20 @@ zfs_dio_page_aligned(void *buf)
 static inline boolean_t
 zfs_dio_offset_aligned(uint64_t offset, uint64_t blksz)
 {
-	return (IS_P2ALIGNED(offset, blksz));
+	return ((IS_P2ALIGNED(offset, blksz)) ? B_TRUE : B_FALSE);
 }
 
 static inline boolean_t
 zfs_dio_size_aligned(uint64_t size, uint64_t blksz)
 {
-	return ((size % blksz) == 0);
+	return (((size % blksz) == 0) ? B_TRUE : B_FALSE);
 }
 
 static inline boolean_t
 zfs_dio_aligned(uint64_t offset, uint64_t size, uint64_t blksz)
 {
-	return (zfs_dio_offset_aligned(offset, blksz) &&
-	    zfs_dio_size_aligned(size, blksz));
+	return ((zfs_dio_offset_aligned(offset, blksz) &&
+	    zfs_dio_size_aligned(size, blksz)) ? B_TRUE : B_FALSE);
 }
 
 static inline void