diff --git a/core/src/ident.rs b/core/src/ident.rs
index 95eab276..0c9fc9a2 100644
--- a/core/src/ident.rs
+++ b/core/src/ident.rs
@@ -24,7 +24,7 @@ impl Ident {
 	pub(crate) fn is_prefix_unit(&self) -> bool {
 		// when changing this also make sure to change number output formatting
 		// lexer identifier splitting
-		self.0 == "$" || self.0 == "\u{a3}"
+		["$", "\u{a3}", "\u{a5}"].contains(&&*self.0)
 	}
 
 	pub(crate) fn serialize(&self, write: &mut impl io::Write) -> FResult<()> {
diff --git a/core/src/lexer.rs b/core/src/lexer.rs
index b2cef15e..88722cb8 100644
--- a/core/src/lexer.rs
+++ b/core/src/lexer.rs
@@ -436,7 +436,7 @@ fn is_valid_in_ident(ch: char, prev: Option<char>) -> bool {
 		'㏌', '㏏', '㏐', '㏓', '㏔', '㏕', '㏖', '㏗', '㏙', '㏛', '㏜', '㏝',
 	];
 	let only_valid_by_themselves = ['%', '‰', '‱', '′', '″', '’', '”', 'π'];
-	let split_on_subsequent_digit = ['$', '£'];
+	let split_on_subsequent_digit = ['$', '£', '¥'];
 	let always_invalid = ['λ'];
 	if always_invalid.contains(&ch) {
 		false
diff --git a/core/src/lib.rs b/core/src/lib.rs
index a1fb2d42..649ac058 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -607,6 +607,7 @@ pub mod test_utils {
 			"HKD" => 8.0,
 			"AUD" => 1.3,
 			"PLN" => 0.2,
+			"JPY" => 149.9,
 			_ => panic!("unknown currency {currency}"),
 		})
 	}
diff --git a/core/src/num/unit.rs b/core/src/num/unit.rs
index 5785886b..a9306506 100644
--- a/core/src/num/unit.rs
+++ b/core/src/num/unit.rs
@@ -948,7 +948,7 @@ impl FormattedValue {
 				kind: SpanKind::Ident,
 			});
 		}
-		if self.unit_str == "$" || self.unit_str == "\u{a3}" && !attrs.plain_number {
+		if ["$", "\u{a3}", "\u{a5}"].contains(&self.unit_str.as_str()) && !attrs.plain_number {
 			spans.push(Span {
 				string: self.unit_str,
 				kind: SpanKind::Ident,
diff --git a/core/src/parser.rs b/core/src/parser.rs
index b552b5dc..87af346c 100644
--- a/core/src/parser.rs
+++ b/core/src/parser.rs
@@ -200,7 +200,7 @@ fn parse_apply_cont<'a>(input: &'a [Token], lhs: &Expr) -> ParseResult<'a> {
 				}
 				Expr::Apply(Box::new(lhs.clone()), Box::new(rhs))
 			}
-			// support e.g. '$5' or '£3'
+			// support e.g. '$5', '£3' or '¥10'
 			(Expr::Ident(i), Expr::Literal(Value::Num(_))) if i.is_prefix_unit() => {
 				Expr::Apply(Box::new(lhs.clone()), Box::new(rhs))
 			}
diff --git a/core/src/units/builtin.rs b/core/src/units/builtin.rs
index 3715764c..dd07a84f 100644
--- a/core/src/units/builtin.rs
+++ b/core/src/units/builtin.rs
@@ -688,7 +688,8 @@ const CURRENCIES: &[UnitTuple] = &[
 	("$", "$", "USD", ""),
 	("euro", "euros", "EUR", ""),
 	("\u{20ac}", "\u{20ac}", "EUR", ""), // Euro symbol
-	("\u{a3}", "\u{a3}", "GBP", ""),
+	("\u{a3}", "\u{a3}", "GBP", ""),     // £
+	("\u{a5}", "\u{a5}", "JPY", ""),     // ¥
 	("AU$", "AU$", "AUD", ""),
 	("HK$", "HK$", "HKD", ""),
 	("NZ$", "NZ$", "NZD", ""),
diff --git a/core/tests/integration_tests.rs b/core/tests/integration_tests.rs
index 83f8ee8a..3f8b3bf4 100644
--- a/core/tests/integration_tests.rs
+++ b/core/tests/integration_tests.rs
@@ -5397,6 +5397,11 @@ fn gbp_symbol() {
 	test_eval("£5 + £3", "£8");
 }
 
+#[test]
+fn jpy_symbol() {
+	test_eval("¥5 + ¥3", "¥8");
+}
+
 #[test]
 fn two_statements() {
 	test_eval("2; 4", "4");