diff --git a/port/jassimp/jassimp-native/src/jassimp.h b/port/jassimp/jassimp-native/src/jassimp.h
index 6f90bb3b6..fadea4fe6 100644
--- a/port/jassimp/jassimp-native/src/jassimp.h
+++ b/port/jassimp/jassimp-native/src/jassimp.h
@@ -7,6 +7,9 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+JNIEXPORT jint JNICALL Java_jassimp_Jassimp_getVKeysize
+  (JNIEnv *, jclass);
+
 /*
  * Class:     jassimp_Jassimp
  * Method:    getErrorString