diff --git a/tcl-string-compare.patch b/tcl-string-compare.patch
new file mode 100644
index 0000000..f15d3b7
--- /dev/null
+++ b/tcl-string-compare.patch
@@ -0,0 +1,30 @@
+Index: generic/tclCmdMZ.c
+==================================================================
+--- generic/tclCmdMZ.c
++++ generic/tclCmdMZ.c
+@@ -2752,23 +2752,11 @@
+ 		s2 = value2Ptr->bytes;
+ 		memCmpFn = memcmp;
+ 	    } else {
+ 		s1 = (char *) Tcl_GetUnicode(value1Ptr);
+ 		s2 = (char *) Tcl_GetUnicode(value2Ptr);
+-		if (
+-#if defined(WORDS_BIGENDIAN) && (TCL_UTF_MAX != 4)
+-			1
+-#else
+-			checkEq
+-#endif /* WORDS_BIGENDIAN */
+-		        ) {
+-		    memCmpFn = memcmp;
+-		    s1len *= sizeof(Tcl_UniChar);
+-		    s2len *= sizeof(Tcl_UniChar);
+-		} else {
+-		    memCmpFn = (memCmpFn_t) Tcl_UniCharNcmp;
+-		}
++		memCmpFn = (memCmpFn_t) Tcl_UniCharNcmp;
+ 	    }
+ 	}
+     } else {
+ 	/*
+ 	 * Get the string representations, being careful in case we have
+
diff --git a/tcl.changes b/tcl.changes
index 5ce0d6d..a38f5c7 100644
--- a/tcl.changes
+++ b/tcl.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Dec 23 15:50:47 UTC 2022 - Reinhard Max <max@suse.com>
+
+- bsc#1206623, tcl-string-compare.patch: Fix a bug in string
+  comparison on big endian that made test string-2.20.1 fail.
+
 -------------------------------------------------------------------
 Wed Nov 23 16:05:02 UTC 2022 - Reinhard Max <max@suse.com>
 
diff --git a/tcl.spec b/tcl.spec
index f02ce41..c364601 100644
--- a/tcl.spec
+++ b/tcl.spec
@@ -49,6 +49,7 @@ Source1:        tcl-rpmlintrc
 Source2:        baselibs.conf
 Source3:        macros.tcl
 Patch0:         tcl-refchan-mode-needed.patch
+Patch1:         tcl-string-compare.patch
 BuildRequires:  autoconf
 BuildRequires:  pkg-config
 BuildRequires:  zlib-devel
@@ -93,6 +94,7 @@ if ! test -d pkgs/itcl%itclver; then
    exit 1
 fi
 %patch0
+%patch1
 
 # The SQLite extension is provided by the sqlite3 package,
 # so don't build it here.