diff --git a/tests/test3.in b/tests/test3.in
index 26e496bce..81a8765e7 100644
--- a/tests/test3.in
+++ b/tests/test3.in
@@ -272,6 +272,6 @@ env DISPLAY="localhost:0.0" ../test/root/bin/fish -c 'echo Elements in DISPLAY:
 # Exported arrays should use record separator, with a few exceptions. So we can use an arbitrary variable for this.
 env FOO=one\x1etwo\x1ethree\x1efour ../test/root/bin/fish -c 'echo Elements in FOO: (count $FOO)'
 # some must use colon separators!
-set -lx MANPATH man1 man2 man3 ; env | grep MANPATH
+set -lx MANPATH man1 man2 man3 ; env | grep '^MANPATH='
 
 true