diff --git a/ikvm-native/jni.c b/ikvm-native/jni.c
index dec858e131f66..e638db1d76f34 100644
--- a/ikvm-native/jni.c
+++ b/ikvm-native/jni.c
@@ -486,11 +486,15 @@ static void* JNIEnv_vtable[] =
 	0  // jlong JNICALL GetDirectBufferCapacity(jobject buf);
 };
 
-JNIEXPORT void** JNICALL ikvm_GetJNIEnvVTable()
+void** ikvm_GetJNIEnvVTable(void);
+
+JNIEXPORT void** JNICALL ikvm_GetJNIEnvVTable(void)
 {
 	return JNIEnv_vtable;
 }
 
+void* JNICALL ikvm_MarshalDelegate(void* p);
+
 JNIEXPORT void* JNICALL ikvm_MarshalDelegate(void* p)
 {
 	return p;
@@ -498,6 +502,8 @@ JNIEXPORT void* JNICALL ikvm_MarshalDelegate(void* p)
 
 typedef jint (JNICALL *PJNI_ONLOAD)(JavaVM* vm, void* reserved);
 
+jint JNICALL ikvm_CallOnLoad(PJNI_ONLOAD method, JavaVM* vm, void* reserved);
+
 JNIEXPORT jint JNICALL ikvm_CallOnLoad(PJNI_ONLOAD method, JavaVM* vm, void* reserved)
 {
 	return method(vm, reserved);
diff --git a/ikvm-native/os.c b/ikvm-native/os.c
index 9f2115f712ba6..43531ae0ea5b5 100644
--- a/ikvm-native/os.c
+++ b/ikvm-native/os.c
@@ -61,16 +61,22 @@
 	#include <sys/mman.h>
 	#include "jni.h"
 
+	void* JNICALL ikvm_LoadLibrary(char* psz);
+
 	JNIEXPORT void* JNICALL ikvm_LoadLibrary(char* psz)
 	{
 		return g_module_open(psz, 0);
 	}
 
+	void JNICALL ikvm_FreeLibrary(GModule* handle);
+
 	JNIEXPORT void JNICALL ikvm_FreeLibrary(GModule* handle)
 	{
 		g_module_close(handle);
 	}
 
+	void* JNICALL ikvm_GetProcAddress(GModule* handle, char* name, jint argc);
+
 	JNIEXPORT void* JNICALL ikvm_GetProcAddress(GModule* handle, char* name, jint argc)
 	{
 		void *symbol;
@@ -83,16 +89,22 @@
 			return NULL;
 	}
 
+	void* JNICALL ikvm_mmap(int fd, jboolean writeable, jboolean copy_on_write, jlong position, jint size);
+
 	JNIEXPORT void* JNICALL ikvm_mmap(int fd, jboolean writeable, jboolean copy_on_write, jlong position, jint size)
 	{
 		return mmap(0, size, writeable ? PROT_WRITE | PROT_READ : PROT_READ, copy_on_write ? MAP_PRIVATE : MAP_SHARED, fd, position);
 	}
 
+	int JNICALL ikvm_munmap(void* address, jint size);
+
 	JNIEXPORT int JNICALL ikvm_munmap(void* address, jint size)
 	{
 		return munmap(address, size);
 	}
 
+	int JNICALL ikvm_msync(void* address, jint size);
+
 	JNIEXPORT int JNICALL ikvm_msync(void* address, jint size)
 	{
 #if defined(__native_client__) && defined(USE_NEWLIB)