diff --git a/sci-biology/yass/files/yass-1.14-lowmem-define.patch b/sci-biology/yass/files/yass-1.14-lowmem-define.patch
new file mode 100644
index 0000000000000..64f2e216a05bc
--- /dev/null
+++ b/sci-biology/yass/files/yass-1.14-lowmem-define.patch
@@ -0,0 +1,13 @@
+Add missing function definition to hash.c
+Whole hash.c is used only if USE=lowmem is enabled.
+https://bugs.gentoo.org/919215
+--- a/src/hash.h
++++ b/src/hash.h
+@@ -57,6 +57,7 @@
+   
+ }Table_hash;
+ 
++long int hashVerifie (Table_hash *table, char *mess,long int diag);
+ 
+ /*
+  *
diff --git a/sci-biology/yass/yass-1.14-r3.ebuild b/sci-biology/yass/yass-1.14-r4.ebuild
similarity index 80%
rename from sci-biology/yass/yass-1.14-r3.ebuild
rename to sci-biology/yass/yass-1.14-r4.ebuild
index be75847e2ad0e..a484aca4269fb 100644
--- a/sci-biology/yass/yass-1.14-r3.ebuild
+++ b/sci-biology/yass/yass-1.14-r4.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -14,7 +14,10 @@ SLOT="0"
 KEYWORDS="~amd64 ~x86"
 IUSE="lowmem threads"
 
-PATCHES=( "${FILESDIR}"/${PV}-as-needed.patch )
+PATCHES=(
+	"${FILESDIR}"/${PV}-as-needed.patch
+	"${FILESDIR}"/${P}-lowmem-define.patch
+)
 
 src_prepare() {
 	default