diff --git a/src/parse.rs b/src/parse.rs
index ef58c02..dc12b3e 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -263,6 +263,8 @@ fn parse_unit(input: String) -> Result<NonMetric, ParseError> {
 		"US cups" => Ok(NonMetric::USCup),
 		"us cup" => Ok(NonMetric::USCup),
 		"us cups" => Ok(NonMetric::USCup),
+		"cup" => Ok(NonMetric::USCup),
+		"cups" => Ok(NonMetric::USCup),
 
 		"US liquid pint" => Ok(NonMetric::USLiquidPint),
 		"US liquid pints" => Ok(NonMetric::USLiquidPint),
@@ -678,6 +680,8 @@ mod test {
 			"US cups",
 			"us cup",
 			"us cups",
+			"cup",
+			"cups",
 		]);
 
 		test_units(NonMetric::USLiquidPint, &[