diff --git a/src/oxt/Makefile.in b/src/oxt/Makefile.in
index ff329dc..5b29b06 100644
--- a/src/oxt/Makefile.in
+++ b/src/oxt/Makefile.in
@@ -70,7 +70,7 @@ BINRLS=$(BINDIR)/Release
 #---[ Build options ]----------------------------------------------------------
 
 CPPUENV="gcc3"
-CXXFLAGS=@CXXFLAGS@ @DLL_CFLAGS@ -Wno-strict-aliasing -I./include -I$(includedir)/libreoffice -Wno-strict-aliasing -DCPPU_ENV=$(CPPUENV) -DLANGUAGE_BINDING_NAME=\"$(CPPUENV)\"
+CXXFLAGS=@CXXFLAGS@ -fvisibility=hidden @DLL_CFLAGS@ -Wno-strict-aliasing -I./include -I$(includedir)/libreoffice -Wno-strict-aliasing -DCPPU_ENV=$(CPPUENV) -DLANGUAGE_BINDING_NAME=\"$(CPPUENV)\"
 
 OO_LDFLAGS=-L$(OO_SDK_HOME)/lib -L$(OO_SDK_URE_HOME)/lib \
 			-Wl,-rpath-link=$(OO_SDK_URE_HOME)/lib,-rpath=$(OO_SDK_URE_HOME)/lib \
diff --git a/src/oxt/service.cc b/src/oxt/service.cc
index d896c0f..31337f8 100644
--- a/src/oxt/service.cc
+++ b/src/oxt/service.cc
@@ -82,17 +82,17 @@ namespace pw3270_impl
 
 extern "C"
 {
-	void * SAL_CALL component_getFactory(sal_Char const * implName, lang::XMultiServiceFactory * xMgr,registry::XRegistryKey * xRegistry )
+	__attribute__((visibility("default"))) void * SAL_CALL component_getFactory(sal_Char const * implName, lang::XMultiServiceFactory * xMgr,registry::XRegistryKey * xRegistry )
 	{
 		return ::cppu::component_getFactoryHelper(implName, xMgr, xRegistry, ::pw3270_impl::s_component_entries );
 	}
 
-	sal_Bool SAL_CALL component_writeInfo(lang::XMultiServiceFactory * xMgr, registry::XRegistryKey * xRegistry )
+	__attribute__((visibility("default"))) sal_Bool SAL_CALL component_writeInfo(lang::XMultiServiceFactory * xMgr, registry::XRegistryKey * xRegistry )
 	{
 		return ::cppu::component_writeInfoHelper(xMgr, xRegistry, ::pw3270_impl::s_component_entries );
 	}
 
-	void SAL_CALL component_getImplementationEnvironment(sal_Char const ** ppEnvTypeName, uno_Environment ** ppEnv )
+	__attribute__((visibility("default"))) void SAL_CALL component_getImplementationEnvironment(sal_Char const ** ppEnvTypeName, uno_Environment ** ppEnv )
 	{
         * ppEnvTypeName = LANGUAGE_BINDING_NAME;
 	}
--
libgit2 0.21.2