diff --git a/libc/src/math/generic/exp2f.cpp b/libc/src/math/generic/exp2f.cpp
--- a/libc/src/math/generic/exp2f.cpp
+++ b/libc/src/math/generic/exp2f.cpp
@@ -65,7 +65,7 @@
       double c2 = fputil::multiply_add(xd, COEFFS[5], COEFFS[4]);
       double p = fputil::polyeval(xsq, c0, c1, c2);
       double r = fputil::multiply_add(p, xd, 1.0);
-      return r;
+      return static_cast<float>(r);
     }
 
     // x >= 128
diff --git a/libc/src/math/generic/tanhf.cpp b/libc/src/math/generic/tanhf.cpp
--- a/libc/src/math/generic/tanhf.cpp
+++ b/libc/src/math/generic/tanhf.cpp
@@ -62,9 +62,9 @@
     int idx = static_cast<int>(sign);
 
     if (LIBC_UNLIKELY(xbits.is_inf()))
-      return SIGNS[idx][0];
+      return static_cast<float>(SIGNS[idx][0]);
 
-    return SIGNS[idx][0] + SIGNS[idx][1];
+    return static_cast<float>(SIGNS[idx][0] + SIGNS[idx][1]);
   }
 
   // Range reduction: e^(2x) = 2^(hi + mid) * e^lo
diff --git a/libc/src/time/difftime.cpp b/libc/src/time/difftime.cpp
--- a/libc/src/time/difftime.cpp
+++ b/libc/src/time/difftime.cpp
@@ -12,7 +12,7 @@
 namespace __llvm_libc {
 
 LLVM_LIBC_FUNCTION(double, difftime, (time_t end, time_t beginning)) {
-  return end - beginning;
+  return static_cast<double>(end - beginning);
 }
 
 } // namespace __llvm_libc