diff --git a/src/consts.rs b/src/consts.rs
index 1da82c3..5947fe1 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -258,9 +258,11 @@ mod tests {
         assert_eq!(f32::from_fixed(SQRT_2), f32::consts::SQRT_2);
         assert_eq!(f32::from_fixed(FRAC_1_SQRT_2), f32::consts::FRAC_1_SQRT_2);
         assert_eq!(f32::from_fixed(E), f32::consts::E);
-        // assert_eq!(f32::from_fixed(LOG2_10), f32::consts::LOG2_10);
+        // TODO when rustc requirement >= 1.43.0, use f32::consts::LOG2_10
+        assert_eq!(f32::from_fixed(LOG2_10), 10f32.log2());
         assert_eq!(f32::from_fixed(LOG2_E), f32::consts::LOG2_E);
-        // assert_eq!(f32::from_fixed(LOG10_2), f32::consts::LOG10_2);
+        // TODO when rustc requirement >= 1.43.0, use f32::consts::LOG10_2
+        assert_eq!(f32::from_fixed(LOG10_2), 2f32.log10());
         assert_eq!(f32::from_fixed(LOG10_E), f32::consts::LOG10_E);
         assert_eq!(f32::from_fixed(LN_2), f32::consts::LN_2);
         assert_eq!(f32::from_fixed(LN_10), f32::consts::LN_10);
@@ -290,9 +292,11 @@ mod tests {
         assert_eq!(f64::from_fixed(SQRT_2), f64::consts::SQRT_2);
         assert_eq!(f64::from_fixed(FRAC_1_SQRT_2), f64::consts::FRAC_1_SQRT_2);
         assert_eq!(f64::from_fixed(E), f64::consts::E);
-        // assert_eq!(f64::from_fixed(LOG2_10), f64::consts::LOG2_10);
+        // TODO when rustc requirement >= 1.43.0, use f64::consts::LOG2_10
+        assert_eq!(f64::from_fixed(LOG2_10), 10f64.log2());
         assert_eq!(f64::from_fixed(LOG2_E), f64::consts::LOG2_E);
-        // assert_eq!(f64::from_fixed(LOG10_2), f64::consts::LOG10_2);
+        // TODO when rustc requirement >= 1.43.0, use f64::consts::LOG10_2
+        assert_eq!(f64::from_fixed(LOG10_2), 2f64.log10());
         assert_eq!(f64::from_fixed(LOG10_E), f64::consts::LOG10_E);
         assert_eq!(f64::from_fixed(LN_2), f64::consts::LN_2);
         assert_eq!(f64::from_fixed(LN_10), f64::consts::LN_10);