diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
index 9b5b0e62a3c1a..a3078eba393a1 100644
--- a/src/libstd/num/f32.rs
+++ b/src/libstd/num/f32.rs
@@ -173,7 +173,7 @@ impl Float for f32 {
     #[inline]
     fn exp(self) -> f32 { num::Float::exp(self) }
     #[inline]
-    fn exp2(self) -> f32 { num::Float::exp(self) }
+    fn exp2(self) -> f32 { num::Float::exp2(self) }
     #[inline]
     fn ln(self) -> f32 { num::Float::ln(self) }
     #[inline]
diff --git a/src/libstd/num/f64.rs b/src/libstd/num/f64.rs
index 1c9558325292b..28b3a7e4ad40d 100644
--- a/src/libstd/num/f64.rs
+++ b/src/libstd/num/f64.rs
@@ -183,7 +183,7 @@ impl Float for f64 {
     #[inline]
     fn exp(self) -> f64 { num::Float::exp(self) }
     #[inline]
-    fn exp2(self) -> f64 { num::Float::exp(self) }
+    fn exp2(self) -> f64 { num::Float::exp2(self) }
     #[inline]
     fn ln(self) -> f64 { num::Float::ln(self) }
     #[inline]