diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index 4483940c9a771..434569020d2a8 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -367,7 +367,7 @@ impl f32 {
     /// Infinity (∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const INFINITY: f32 = 1.0_f32 / 0.0_f32;
-    /// Negative infinity (-∞).
+    /// Negative infinity (−∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const NEG_INFINITY: f32 = -1.0_f32 / 0.0_f32;
 
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index df45e588369fe..6476ddb4541ff 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -366,7 +366,7 @@ impl f64 {
     /// Infinity (∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const INFINITY: f64 = 1.0_f64 / 0.0_f64;
-    /// Negative infinity (-∞).
+    /// Negative infinity (−∞).
     #[stable(feature = "assoc_int_consts", since = "1.43.0")]
     pub const NEG_INFINITY: f64 = -1.0_f64 / 0.0_f64;