diff --git a/runtime/internal/lib/runtime/_wrap/runtime.c b/runtime/internal/lib/runtime/_wrap/runtime.cpp
similarity index 77%
rename from runtime/internal/lib/runtime/_wrap/runtime.c
rename to runtime/internal/lib/runtime/_wrap/runtime.cpp
index 4dc23cfd..f97d91bd 100644
--- a/runtime/internal/lib/runtime/_wrap/runtime.c
+++ b/runtime/internal/lib/runtime/_wrap/runtime.cpp
@@ -1,10 +1,12 @@
 #include <unistd.h>
 
-int llgo_maxprocs()
-{
+extern "C" {
+
+int llgo_maxprocs() {
 #ifdef _SC_NPROCESSORS_ONLN
     return (int)sysconf(_SC_NPROCESSORS_ONLN);
 #else
     return 1;
 #endif
 }
+}
\ No newline at end of file
diff --git a/runtime/internal/lib/runtime/runtime.go b/runtime/internal/lib/runtime/runtime.go
index 398d248a..116bcc48 100644
--- a/runtime/internal/lib/runtime/runtime.go
+++ b/runtime/internal/lib/runtime/runtime.go
@@ -28,7 +28,7 @@ type _runtime struct{}
 
 const (
 	LLGoPackage = "link"
-	LLGoFiles   = "_wrap/runtime.c"
+	LLGoFiles   = "_wrap/runtime.cpp"
 )
 
 // GOROOT returns the root of the Go tree. It uses the