diff --git a/dlls/dbghelp/dbghelp.spec b/dlls/dbghelp/dbghelp.spec
index b95a9e728bf..360c6d46ee1 100644
--- a/dlls/dbghelp/dbghelp.spec
+++ b/dlls/dbghelp/dbghelp.spec
@@ -30,8 +30,8 @@
 @ stdcall SearchTreeForFileW(wstr wstr ptr)
 @ stdcall StackWalk(long long long ptr ptr ptr ptr ptr ptr)
 @ stdcall StackWalk64(long long long ptr ptr ptr ptr ptr ptr)
-@ stub SymAddSymbol
-@ stub SymAddSymbolW
+@ stdcall SymAddSymbol(ptr double str double long long)
+@ stdcall SymAddSymbolW(ptr double wstr double long long)
 @ stdcall SymCleanup(long)
 @ stdcall SymEnumLines(ptr double str str ptr ptr)
 @ stub SymEnumLinesW
diff --git a/dlls/dbghelp/symbol.c b/dlls/dbghelp/symbol.c
index 682f37ae5d5..ca6ec61fefe 100644
--- a/dlls/dbghelp/symbol.c
+++ b/dlls/dbghelp/symbol.c
@@ -1716,3 +1716,37 @@ BOOL WINAPI SymSearchW(HANDLE hProcess, ULONG64 BaseOfDll, DWORD Index,
 
     return ret;
 }
+
+/******************************************************************
+ *		SymAddSymbol (DBGHELP.@)
+ *
+ */
+BOOL WINAPI SymAddSymbol(HANDLE hProcess, ULONG64 BaseOfDll, PCSTR name,
+                         DWORD64 addr, DWORD size, DWORD flags)
+{
+    WCHAR       nameW[MAX_SYM_NAME];
+
+    MultiByteToWideChar(CP_ACP, 0, name, -1, nameW, sizeof(nameW) / sizeof(WCHAR));
+    return SymAddSymbolW(hProcess, BaseOfDll, nameW, addr, size, flags);
+}
+
+/******************************************************************
+ *		SymAddSymbolW (DBGHELP.@)
+ *
+ */
+BOOL WINAPI SymAddSymbolW(HANDLE hProcess, ULONG64 BaseOfDll, PCWSTR name,
+                          DWORD64 addr, DWORD size, DWORD flags)
+{
+    struct module_pair  pair;
+
+    TRACE("(%p %s %s %u)\n", hProcess, wine_dbgstr_w(name), wine_dbgstr_longlong(addr), size);
+
+    pair.pcs = process_find_by_handle(hProcess);
+    if (!pair.pcs) return FALSE;
+    pair.requested = module_find_by_addr(pair.pcs, BaseOfDll, DMT_UNKNOWN);
+    if (!module_get_debug(&pair)) return FALSE;
+
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return FALSE;
+}
+