diff --git a/src/tests/e2e-test-subrs b/src/tests/e2e-test-subrs
index 8f2054b..d1d84f1 100644
--- a/src/tests/e2e-test-subrs
+++ b/src/tests/e2e-test-subrs
@@ -81,6 +81,19 @@ set_locale()
     return 1
 }
 
+# Given two versions, return success if the first version is less than
+# or equal to the second version.
+versionlte()
+{
+    [  "$1" = "$(printf "$1\n$2\n" | sort -V | head -n1)" ]
+}
+versionlt() {
+    if [ "$1" = "$2" ]; then
+	return 1
+    fi
+    versionlte "$1" "$2"
+}
+
 # Tmux check.
 tmux_check()
 {
@@ -103,11 +116,8 @@ tmux_check()
 	return 0
     fi
     version=${version##tmux }
-    version_major=${version%%.*}
-    version_minor=${version##*.}
 
-    if [ "$version_major" -lt "$need_major" ] ||
-	{ [ "$version_major" -eq "$need_major" ] && [ "$version_minor" -lt "$need_minor" ]; }; then
+    if versionlt "$version" "$need_major.$need_minor"; then
 	printf "tmux version %s too old\n" "$version" >&2
 	return 1
     fi
diff --git a/src/tests/emulation-attributes.test b/src/tests/emulation-attributes.test
index e4ba2f3..7e22019 100755
--- a/src/tests/emulation-attributes.test
+++ b/src/tests/emulation-attributes.test
@@ -27,6 +27,14 @@ if [ "$(basename "$0")" = emulation-attributes-bce.test ] &&
     exit 77
 fi
 
+# tmux 3.3a has a behavior change in how BCE is handled, which has
+# been reverted: https://github.com/tmux/tmux/issues/3339
+if [ "$(basename "$0")" = emulation-attributes-bce.test ] &&
+   tmux_check 3 3a && ! tmux_check 3 3b; then
+    printf "tmux 3.3a has incompatible BCE behavior\n" >&2
+    exit 77
+fi
+
 # Top-level wrapper.
 if [ $# -eq 0 ]; then
     e2e-test "$0" baseline direct verify