diff --git a/polymer/eduke32/source/android/etcpak/ProcessRGB.hpp b/polymer/eduke32/source/android/etcpak/ProcessRGB.hpp
index a81b29286..de8da332d 100644
--- a/polymer/eduke32/source/android/etcpak/ProcessRGB.hpp
+++ b/polymer/eduke32/source/android/etcpak/ProcessRGB.hpp
@@ -3,7 +3,15 @@
 
 #include "Types.hpp"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 uint64 ProcessRGB( const uint8* src );
 uint64 ProcessRGB_ETC2( const uint8* src );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif