diff --git a/sys-fs/btrfs-progs/btrfs-progs-4.19.ebuild b/sys-fs/btrfs-progs/btrfs-progs-4.19.ebuild
index 04d5383960949..c0e82c0a114e5 100644
--- a/sys-fs/btrfs-progs/btrfs-progs-4.19.ebuild
+++ b/sys-fs/btrfs-progs/btrfs-progs-4.19.ebuild
@@ -72,6 +72,10 @@ fi
 
 REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
 
+PATCHES=(
+	"${FILESDIR}"/${P}-be-bswap.patch
+)
+
 pkg_setup() {
 	use python && python-single-r1_pkg_setup
 }
diff --git a/sys-fs/btrfs-progs/files/btrfs-progs-4.19-be-bswap.patch b/sys-fs/btrfs-progs/files/btrfs-progs-4.19-be-bswap.patch
new file mode 100644
index 0000000000000..b91b320408551
--- /dev/null
+++ b/sys-fs/btrfs-progs/files/btrfs-progs-4.19-be-bswap.patch
@@ -0,0 +1,24 @@
+Fix build failure on big-endian platforms.
+
+Reported-by: ernsteiswuerfel
+Bug: https://bugs.gentoo.org/670741
+--- a/kernel-lib/bitops.h
++++ b/kernel-lib/bitops.h
+@@ -180,5 +180,5 @@ static inline unsigned long ext2_swab(const unsigned long y)
+ #if BITS_PER_LONG == 64
+-	return (unsigned long) bswap64((u64) y);
++	return (unsigned long) bswap_64((u64) y);
+ #elif BITS_PER_LONG == 32
+-	return (unsigned long) bswap32((u32) y);
++	return (unsigned long) bswap_32((u32) y);
+ #else
+@@ -220,3 +220,3 @@ static inline unsigned long _find_next_bit_le(const unsigned long *addr1,
+ 
+-unsigned long find_next_zero_bit_le(const void *addr, unsigned long size,
++static inline unsigned long find_next_zero_bit_le(const void *addr, unsigned long size,
+ 		unsigned long offset)
+@@ -227,3 +227,3 @@ unsigned long find_next_zero_bit_le(const void *addr, unsigned long size,
+ 
+-unsigned long find_next_bit_le(const void *addr, unsigned long size,
++static inline unsigned long find_next_bit_le(const void *addr, unsigned long size,
+ 		unsigned long offset)