diff --git a/JGE/src/testfeatures.c b/JGE/src/testfeatures.c
index 88fcc3c39..e7d8f7414 100644
--- a/JGE/src/testfeatures.c
+++ b/JGE/src/testfeatures.c
@@ -1,2 +1,4 @@
+extern "C" {
 void FSOUND_Close();
+}
 int main() { FSOUND_Close(); }
diff --git a/projects/mtg/src/testfeatures.c b/projects/mtg/src/testfeatures.c
index 88fcc3c39..e7d8f7414 100644
--- a/projects/mtg/src/testfeatures.c
+++ b/projects/mtg/src/testfeatures.c
@@ -1,2 +1,4 @@
+extern "C" {
 void FSOUND_Close();
+}
 int main() { FSOUND_Close(); }