diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index 7c861f9daf..723408f20c 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -766,6 +766,12 @@ size_t IC_CharSet::WC2MB(char *buf, const wchar_t *psz, size_t n)
 
 #if defined(__WIN32__) && !defined(__WXMICROWIN__)
 
+#ifdef __WXWINE__
+    #define WINE_CAST (WCHAR *)
+#else
+    #define WINE_CAST
+#endif
+
 extern long wxCharsetToCodepage(const wxChar *charset); // from utils.cpp
 
 class CP_CharSet : public wxCharacterSet
@@ -779,29 +785,37 @@ public:
 
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
     {
-        size_t len =
-#ifdef __WXWINE__
-            MultiByteToWideChar(m_CodePage, 0, psz, -1, (WCHAR*) buf, buf ? n : 0);
-#else
-            MultiByteToWideChar(m_CodePage, 0, psz, -1, buf, buf ? n : 0);
-#endif
-        //VS: returns # of written chars for buf!=NULL and *size*
-        //    needed buffer for buf==NULL
-        return len ? (buf ? len : len-1) : (size_t)-1;
+        const size_t len = ::MultiByteToWideChar
+                             (
+                                m_CodePage,     // code page
+                                0,              // flags (none)
+                                psz,            // input string
+                                -1,             // its length (NUL-terminated)
+                                WINE_CAST buf,  // output string
+                                buf ? n : 0     // size of output buffer
+                             );
+
+        // note that it returns # of written chars for buf != NULL and *size*
+        // of the needed buffer for buf == NULL
+        return len ? (buf ? len : len - 1) : (size_t)-1;
     }
 
     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
     {
-#ifdef __WXWINE__
-        size_t len = WideCharToMultiByte(m_CodePage, 0, (const WCHAR*) psz, -1, buf,
-                                         buf ? n : 0, NULL, NULL);
-#else
-        size_t len = WideCharToMultiByte(m_CodePage, 0, psz, -1, buf,
-                                         buf ? n : 0, NULL, NULL);
-#endif
-        //VS: returns # of written chars for buf!=NULL and *size*
-        //    needed buffer for buf==NULL
-        return len ? (buf ? len : len-1) : (size_t)-1;
+        const size_t len = ::WideCharToMultiByte
+                             (
+                                m_CodePage,     // code page
+                                0,              // flags (none)
+                                WINE_CAST psz,  // input string
+                                -1,             // it is (wide) NUL-terminated
+                                buf,            // output buffer
+                                buf ? n : 0,    // and its size
+                                NULL,           // default "replacement" char
+                                NULL            // [out] was it used?
+                             );
+
+        // see the comment above!
+        return len ? (buf ? len : len - 1) : (size_t)-1;
     }
 
     bool usable() const