diff --git a/dlls/mscoree/metadata.c b/dlls/mscoree/metadata.c
index a2db50828d3..5c343f05cf7 100644
--- a/dlls/mscoree/metadata.c
+++ b/dlls/mscoree/metadata.c
@@ -169,7 +169,7 @@ static HRESULT WINAPI MetaDataDispenser_FindAssemblyModule(IMetaDataDispenserEx*
     return E_NOTIMPL;
 }
 
-const struct IMetaDataDispenserExVtbl MetaDataDispenserVtbl =
+static const struct IMetaDataDispenserExVtbl MetaDataDispenserVtbl =
 {
     MetaDataDispenser_QueryInterface,
     MetaDataDispenser_AddRef,
diff --git a/dlls/mscoree/metahost.c b/dlls/mscoree/metahost.c
index 98f1cbb6892..8fb846ccaef 100644
--- a/dlls/mscoree/metahost.c
+++ b/dlls/mscoree/metahost.c
@@ -46,7 +46,7 @@ static const WCHAR net_11_subdir[] = {'1','.','0',0};
 static const WCHAR net_20_subdir[] = {'2','.','0',0};
 static const WCHAR net_40_subdir[] = {'4','.','0',0};
 
-const struct ICLRRuntimeInfoVtbl CLRRuntimeInfoVtbl;
+static const struct ICLRRuntimeInfoVtbl CLRRuntimeInfoVtbl;
 
 #define NUM_RUNTIMES 3
 
@@ -528,7 +528,7 @@ static HRESULT WINAPI CLRRuntimeInfo_IsStarted(ICLRRuntimeInfo* iface,
     return E_NOTIMPL;
 }
 
-const struct ICLRRuntimeInfoVtbl CLRRuntimeInfoVtbl = {
+static const struct ICLRRuntimeInfoVtbl CLRRuntimeInfoVtbl = {
     CLRRuntimeInfo_QueryInterface,
     CLRRuntimeInfo_AddRef,
     CLRRuntimeInfo_Release,
@@ -767,7 +767,7 @@ struct InstalledRuntimeEnum
     ULONG pos;
 };
 
-const struct IEnumUnknownVtbl InstalledRuntimeEnum_Vtbl;
+static const struct IEnumUnknownVtbl InstalledRuntimeEnum_Vtbl;
 
 static inline struct InstalledRuntimeEnum *impl_from_IEnumUnknown(IEnumUnknown *iface)
 {
@@ -909,7 +909,7 @@ static HRESULT WINAPI InstalledRuntimeEnum_Clone(IEnumUnknown *iface, IEnumUnkno
     return S_OK;
 }
 
-const struct IEnumUnknownVtbl InstalledRuntimeEnum_Vtbl = {
+static const struct IEnumUnknownVtbl InstalledRuntimeEnum_Vtbl = {
     InstalledRuntimeEnum_QueryInterface,
     InstalledRuntimeEnum_AddRef,
     InstalledRuntimeEnum_Release,
diff --git a/dlls/mscoree/mscoree_private.h b/dlls/mscoree/mscoree_private.h
index 5428f17f60e..1b583c64b71 100644
--- a/dlls/mscoree/mscoree_private.h
+++ b/dlls/mscoree/mscoree_private.h
@@ -20,18 +20,18 @@
 #ifndef __MSCOREE_PRIVATE__
 #define __MSCOREE_PRIVATE__
 
-extern char *WtoA(LPCWSTR wstr);
+extern char *WtoA(LPCWSTR wstr) DECLSPEC_HIDDEN;
 
-extern HRESULT CLRMetaHost_CreateInstance(REFIID riid, void **ppobj);
+extern HRESULT CLRMetaHost_CreateInstance(REFIID riid, void **ppobj) DECLSPEC_HIDDEN;
 
 extern HRESULT WINAPI CLRMetaHost_GetVersionFromFile(ICLRMetaHost* iface,
-    LPCWSTR pwzFilePath, LPWSTR pwzBuffer, DWORD *pcchBuffer);
+    LPCWSTR pwzFilePath, LPWSTR pwzBuffer, DWORD *pcchBuffer) DECLSPEC_HIDDEN;
 
 typedef struct tagASSEMBLY ASSEMBLY;
 
-HRESULT assembly_create(ASSEMBLY **out, LPCWSTR file);
-HRESULT assembly_release(ASSEMBLY *assembly);
-HRESULT assembly_get_runtime_version(ASSEMBLY *assembly, LPSTR *version);
+HRESULT assembly_create(ASSEMBLY **out, LPCWSTR file) DECLSPEC_HIDDEN;
+HRESULT assembly_release(ASSEMBLY *assembly) DECLSPEC_HIDDEN;
+HRESULT assembly_get_runtime_version(ASSEMBLY *assembly, LPSTR *version) DECLSPEC_HIDDEN;
 
 typedef struct RuntimeHost RuntimeHost;
 
@@ -49,11 +49,11 @@ typedef struct CLRRuntimeInfo
 } CLRRuntimeInfo;
 
 extern HRESULT get_runtime_info(LPCWSTR exefile, LPCWSTR version, LPCWSTR config_file,
-    DWORD startup_flags, DWORD runtimeinfo_flags, BOOL legacy, ICLRRuntimeInfo **result);
+    DWORD startup_flags, DWORD runtimeinfo_flags, BOOL legacy, ICLRRuntimeInfo **result) DECLSPEC_HIDDEN;
 
-extern HRESULT ICLRRuntimeInfo_GetRuntimeHost(ICLRRuntimeInfo *iface, RuntimeHost **result);
+extern HRESULT ICLRRuntimeInfo_GetRuntimeHost(ICLRRuntimeInfo *iface, RuntimeHost **result) DECLSPEC_HIDDEN;
 
-extern HRESULT MetaDataDispenser_CreateInstance(IUnknown **ppUnk);
+extern HRESULT MetaDataDispenser_CreateInstance(IUnknown **ppUnk) DECLSPEC_HIDDEN;
 
 typedef struct parsed_config_file
 {
@@ -66,9 +66,9 @@ typedef struct supported_runtime
     LPWSTR version;
 } supported_runtime;
 
-extern HRESULT parse_config_file(LPCWSTR filename, parsed_config_file *result);
+extern HRESULT parse_config_file(LPCWSTR filename, parsed_config_file *result) DECLSPEC_HIDDEN;
 
-extern void free_parsed_config_file(parsed_config_file *file);
+extern void free_parsed_config_file(parsed_config_file *file) DECLSPEC_HIDDEN;
 
 /* Mono embedding */
 typedef struct _MonoDomain MonoDomain;
@@ -129,20 +129,20 @@ typedef struct loaded_mono
 } loaded_mono;
 
 /* loaded runtime interfaces */
-extern void unload_all_runtimes(void);
+extern void unload_all_runtimes(void) DECLSPEC_HIDDEN;
 
-extern void expect_no_runtimes(void);
+extern void expect_no_runtimes(void) DECLSPEC_HIDDEN;
 
 extern HRESULT RuntimeHost_Construct(const CLRRuntimeInfo *runtime_version,
-    loaded_mono *loaded_mono, RuntimeHost** result);
+    loaded_mono *loaded_mono, RuntimeHost** result) DECLSPEC_HIDDEN;
 
-extern HRESULT RuntimeHost_GetInterface(RuntimeHost *This, REFCLSID clsid, REFIID riid, void **ppv);
+extern HRESULT RuntimeHost_GetInterface(RuntimeHost *This, REFCLSID clsid, REFIID riid, void **ppv) DECLSPEC_HIDDEN;
 
-extern HRESULT RuntimeHost_GetIUnknownForObject(RuntimeHost *This, MonoObject *obj, IUnknown **ppUnk);
+extern HRESULT RuntimeHost_GetIUnknownForObject(RuntimeHost *This, MonoObject *obj, IUnknown **ppUnk) DECLSPEC_HIDDEN;
 
 extern HRESULT RuntimeHost_CreateManagedInstance(RuntimeHost *This, LPCWSTR name,
-    MonoDomain *domain, MonoObject **result);
+    MonoDomain *domain, MonoObject **result) DECLSPEC_HIDDEN;
 
-extern HRESULT RuntimeHost_Destroy(RuntimeHost *This);
+extern HRESULT RuntimeHost_Destroy(RuntimeHost *This) DECLSPEC_HIDDEN;
 
 #endif   /* __MSCOREE_PRIVATE__ */