diff --git a/libstdc++/include/cmath b/libstdc++/include/cmath
index bf697ff..be70343 100644
--- a/libstdc++/include/cmath
+++ b/libstdc++/include/cmath
@@ -37,6 +37,8 @@
 #include <cstddef>
 #include <math.h>
 
+extern "C++" {
+
 namespace std
 {
 // Functions.
@@ -68,4 +70,6 @@
 using ::fmod;
 }  // namespace std
 
+}  // extern C++
+
 #endif  // BIONIC_LIBSTDCPP_INCLUDE_CMATH__