diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index da8dd9acd9f48..0a4fc6464ca97 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -130,7 +130,7 @@ pub mod consts {
     pub const LOG2_E: f32 = 1.44269504088896340735992468100189214_f32;
 
     /// log<sub>2</sub>(10)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG2_10: f32 = 3.32192809488736234787031942948939018_f32;
 
     /// log<sub>10</sub>(e)
@@ -138,7 +138,7 @@ pub mod consts {
     pub const LOG10_E: f32 = 0.434294481903251827651128918916605082_f32;
 
     /// log<sub>10</sub>(2)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG10_2: f32 = 0.301029995663981195213738894724493027_f32;
 
     /// ln(2)
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index a6081f184ab22..a3acf0f23c4e2 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -126,7 +126,7 @@ pub mod consts {
     pub const E: f64 = 2.71828182845904523536028747135266250_f64;
 
     /// log<sub>2</sub>(10)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG2_10: f64 = 3.32192809488736234787031942948939018_f64;
 
     /// log<sub>2</sub>(e)
@@ -134,7 +134,7 @@ pub mod consts {
     pub const LOG2_E: f64 = 1.44269504088896340735992468100189214_f64;
 
     /// log<sub>10</sub>(2)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG10_2: f64 = 0.301029995663981195213738894724493027_f64;
 
     /// log<sub>10</sub>(e)