diff --git a/dev-libs/leancrypto/files/leancrypto-1.7.2-m68k.patch b/dev-libs/leancrypto/files/leancrypto-1.7.2-m68k.patch
new file mode 100644
index 0000000000000..786f610b7434b
--- /dev/null
+++ b/dev-libs/leancrypto/files/leancrypto-1.7.2-m68k.patch
@@ -0,0 +1,27 @@
+From dfeea66a9aac33916d24be6dbb9b72629a6b63e7 Mon Sep 17 00:00:00 2001
+From: James Le Cuirot <chewi@gentoo.org>
+Date: Sun, 17 May 2026 21:22:20 +0100
+Subject: [PATCH] ChaCha20: Align lc_sym_state to at least 4 bytes to fix m68k
+
+m68k aligns to 2 bytes by default.
+
+Signed-off-by: James Le Cuirot <chewi@gentoo.org>
+--- a/sym/api/lc_chacha20_private.h
++++ b/sym/api/lc_chacha20_private.h
+@@ -39,8 +39,12 @@ extern "C" {
+  * For accelerated ChaCha20 implementatinos, the key and the counter must be
+  * aligned to 16 bytes boundary. This is guaranteed when aligning the entire
+  * structure to 16 bytes as the constant field is 16 bytes in size.
++ *
++ * Force at least 4-byte alignment so that sizeof(struct lc_sym_state) is
++ * consistent (132) on architectures where uint32_t has only 2-byte alignment
++ * (e.g. m68k without -malign-int).
+  */
+-struct lc_sym_state {
++struct __attribute__((aligned(4))) lc_sym_state {
+ 	uint32_t constants[4];
+ 	union {
+ 		uint32_t u[LC_CC20_KEY_SIZE_WORDS];
+-- 
+2.54.0
+
diff --git a/dev-libs/leancrypto/leancrypto-1.7.2-r3.ebuild b/dev-libs/leancrypto/leancrypto-1.7.2-r3.ebuild
index f35ed03635fb4..ba7ee1eb0e70c 100644
--- a/dev-libs/leancrypto/leancrypto-1.7.2-r3.ebuild
+++ b/dev-libs/leancrypto/leancrypto-1.7.2-r3.ebuild
@@ -36,6 +36,7 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-1.6.0-no-force-lto.patch
 	"${FILESDIR}"/${PN}-1.7.2-toolchain-hardening.patch
 	"${FILESDIR}"/${P}-gcc-16-asm.patch
+	"${FILESDIR}"/${PN}-1.7.2-m68k.patch
 )
 
 src_configure() {