diff --git a/dlls/dbghelp/dbghelp.c b/dlls/dbghelp/dbghelp.c
index a0424aa15cd..0bb591babe6 100644
--- a/dlls/dbghelp/dbghelp.c
+++ b/dlls/dbghelp/dbghelp.c
@@ -295,6 +295,7 @@ static BOOL check_live_target(struct process* pcs)
 BOOL WINAPI SymInitializeW(HANDLE hProcess, PCWSTR UserSearchPath, BOOL fInvadeProcess)
 {
     struct process*     pcs;
+    BOOL wow64, child_wow64;
 
     TRACE("(%p %s %u)\n", hProcess, debugstr_w(UserSearchPath), fInvadeProcess);
 
@@ -312,6 +313,12 @@ BOOL WINAPI SymInitializeW(HANDLE hProcess, PCWSTR UserSearchPath, BOOL fInvadeP
 
     pcs->handle = hProcess;
 
+    IsWow64Process(GetCurrentProcess(), &wow64);
+
+    if (!IsWow64Process(hProcess, &child_wow64))
+        return FALSE;
+    pcs->is_64bit = (sizeof(void *) == 8 || wow64) && !child_wow64;
+
     if (UserSearchPath)
     {
         pcs->search_path = lstrcpyW(HeapAlloc(GetProcessHeap(), 0,      
diff --git a/dlls/dbghelp/dbghelp_private.h b/dlls/dbghelp/dbghelp_private.h
index f37991dacd6..3c1b3dd8ca6 100644
--- a/dlls/dbghelp/dbghelp_private.h
+++ b/dlls/dbghelp/dbghelp_private.h
@@ -403,6 +403,8 @@ struct process
 
     unsigned                    buffer_size;
     void*                       buffer;
+
+    BOOL                        is_64bit;
 };
 
 struct line_info
@@ -609,7 +611,7 @@ extern void         module_reset_debug_info(struct module* module) DECLSPEC_HIDD
 extern BOOL         module_remove(struct process* pcs,
                                   struct module* module) DECLSPEC_HIDDEN;
 extern void         module_set_module(struct module* module, const WCHAR* name) DECLSPEC_HIDDEN;
-extern const WCHAR *get_wine_loader_name(void) DECLSPEC_HIDDEN;
+extern WCHAR *      get_wine_loader_name(struct process *pcs) DECLSPEC_HIDDEN;
 
 /* msc.c */
 extern BOOL         pe_load_debug_directory(const struct process* pcs,
diff --git a/dlls/dbghelp/elf_module.c b/dlls/dbghelp/elf_module.c
index e841b1b707a..4d877b44214 100644
--- a/dlls/dbghelp/elf_module.c
+++ b/dlls/dbghelp/elf_module.c
@@ -50,6 +50,7 @@
 
 #include "wine/library.h"
 #include "wine/debug.h"
+#include "wine/heap.h"
 
 #ifdef __ELF__
 
@@ -1568,13 +1569,17 @@ static BOOL elf_enum_modules_internal(const struct process* pcs,
  */
 static BOOL elf_search_loader(struct process* pcs, struct elf_info* elf_info)
 {
+    WCHAR *loader = get_wine_loader_name(pcs);
     PROCESS_BASIC_INFORMATION pbi;
     ULONG_PTR base = 0;
+    BOOL ret;
 
     if (!NtQueryInformationProcess( pcs->handle, ProcessBasicInformation, &pbi, sizeof(pbi), NULL ))
         ReadProcessMemory( pcs->handle, &pbi.PebBaseAddress->Reserved[0], &base, sizeof(base), NULL );
 
-    return elf_search_and_load_file(pcs, get_wine_loader_name(), base, 0, elf_info);
+    ret = elf_search_and_load_file(pcs, loader, base, 0, elf_info);
+    heap_free(loader);
+    return ret;
 }
 
 /******************************************************************
diff --git a/dlls/dbghelp/macho_module.c b/dlls/dbghelp/macho_module.c
index 01fa300eff7..4018c9dbf2d 100644
--- a/dlls/dbghelp/macho_module.c
+++ b/dlls/dbghelp/macho_module.c
@@ -1703,6 +1703,7 @@ BOOL    macho_synchronize_module_list(struct process* pcs)
  */
 static BOOL macho_search_loader(struct process* pcs, struct macho_info* macho_info)
 {
+    WCHAR *loader = get_wine_loader_name(pcs);
     BOOL ret = FALSE;
     ULONG_PTR dyld_image_info_address;
     struct dyld_all_image_infos image_infos;
@@ -1757,7 +1758,8 @@ static BOOL macho_search_loader(struct process* pcs, struct macho_info* macho_in
     }
 
     if (!ret)
-        ret = macho_search_and_load_file(pcs, get_wine_loader_name(), 0, macho_info);
+        ret = macho_search_and_load_file(pcs, loader, 0, macho_info);
+    heap_free(loader);
     return ret;
 }
 
diff --git a/dlls/dbghelp/module.c b/dlls/dbghelp/module.c
index 7a238123c7a..36598737242 100644
--- a/dlls/dbghelp/module.c
+++ b/dlls/dbghelp/module.c
@@ -139,43 +139,38 @@ void module_set_module(struct module* module, const WCHAR* name)
     module_fill_module(name, module->modulename, sizeof(module->modulename) / sizeof(module->modulename[0]));
 }
 
-const WCHAR *get_wine_loader_name(void)
+/* Returned string must be freed by caller */
+WCHAR *get_wine_loader_name(struct process *pcs)
 {
-    static const BOOL is_win64 = sizeof(void *) > sizeof(int); /* FIXME: should depend on target process */
     static const WCHAR wineW[] = {'w','i','n','e',0};
     static const WCHAR suffixW[] = {'6','4',0};
-    static const WCHAR *loader;
+    WCHAR *buffer, *p;
+    const char *env;
 
-    if (!loader)
+    /* All binaries are loaded with WINELOADER (if run from tree) or by the
+     * main executable
+     */
+    if ((env = getenv("WINELOADER")))
     {
-        WCHAR *p, *buffer;
-        const char *ptr;
-
-        /* All binaries are loaded with WINELOADER (if run from tree) or by the
-         * main executable
-         */
-        if ((ptr = getenv("WINELOADER")))
-        {
-            DWORD len = 2 + MultiByteToWideChar( CP_UNIXCP, 0, ptr, -1, NULL, 0 );
-            buffer = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
-            MultiByteToWideChar( CP_UNIXCP, 0, ptr, -1, buffer, len );
-        }
-        else
-        {
-            buffer = HeapAlloc( GetProcessHeap(), 0, sizeof(wineW) + 2 * sizeof(WCHAR) );
-            strcpyW( buffer, wineW );
-        }
-        p = buffer + strlenW( buffer ) - strlenW( suffixW );
-        if (p > buffer && !strcmpW( p, suffixW ))
-        {
-            if (!is_win64) *p = 0;
-        }
-        else if (is_win64) strcatW( buffer, suffixW );
-
-        TRACE( "returning %s\n", debugstr_w(buffer) );
-        loader = buffer;
+        DWORD len = 2 + MultiByteToWideChar( CP_UNIXCP, 0, env, -1, NULL, 0 );
+        buffer = heap_alloc( len * sizeof(WCHAR) );
+        MultiByteToWideChar( CP_UNIXCP, 0, env, -1, buffer, len );
     }
-    return loader;
+    else
+    {
+        buffer = heap_alloc( sizeof(wineW) + 2 * sizeof(WCHAR) );
+        strcpyW( buffer, wineW );
+    }
+
+    p = buffer + strlenW( buffer ) - strlenW( suffixW );
+    if (p > buffer && !strcmpW( p, suffixW ))
+        *p = 0;
+
+    if (pcs->is_64bit)
+        strcatW(buffer, suffixW);
+
+    TRACE( "returning %s\n", debugstr_w(buffer) );
+    return buffer;
 }
 
 static const char*      get_module_type(enum module_type type, BOOL virtual)