diff --git a/core/io/binary/binary-tests.factor b/core/io/binary/binary-tests.factor
index 8ed3a627d9..a386c6d3ca 100644
--- a/core/io/binary/binary-tests.factor
+++ b/core/io/binary/binary-tests.factor
@@ -8,6 +8,12 @@ IN: io.binary.tests
     B{ 0x11 0x22 0x33 } le>
 ] unit-test
 
+{ 0x04030201 } [ B{ 1 2 3 4 } signed-le> ] unit-test
+{ 0x01020304 } [ B{ 1 2 3 4 } signed-be> ] unit-test
+
+{ -12 } [ B{ 0xf4 0xff 0xff 0xff } signed-le> ] unit-test
+{ -12 } [ B{ 0xff 0xff 0xff 0xf4 } signed-be> ] unit-test
+
 [ 0x7a2c793b2ff08554 ] [
     B{ 0x54 0x85 0xf0 0x2f 0x3b 0x79 0x2c 0x7a } le>
 ] unit-test