diff --git a/tools/winebuild/build.h b/tools/winebuild/build.h
index 73effae1c2c..5186aad3848 100644
--- a/tools/winebuild/build.h
+++ b/tools/winebuild/build.h
@@ -88,7 +88,6 @@ typedef struct
 {
     char            *file_name;          /* file name of the dll */
     char            *dll_name;           /* internal name of the dll */
-    char            *owner_name;         /* name of the 32-bit dll owning this one */
     char            *init_func;          /* initialization routine */
     SPEC_TYPE        type;               /* type of dll (Win16/Win32) */
     int              base;               /* ordinal base */
diff --git a/tools/winebuild/main.c b/tools/winebuild/main.c
index 50d8715aec0..aaba9194837 100644
--- a/tools/winebuild/main.c
+++ b/tools/winebuild/main.c
@@ -373,7 +373,6 @@ static char **parse_options( int argc, char **argv, DLLSPEC *spec )
             lib_path[nb_lib_paths++] = xstrdup( optarg );
             break;
         case 'M':
-            spec->owner_name = xstrdup( optarg );
             spec->type = SPEC_WIN16;
             break;
         case 'N':
diff --git a/tools/winebuild/utils.c b/tools/winebuild/utils.c
index 10b92bb2e2f..19a8c7b4ca1 100644
--- a/tools/winebuild/utils.c
+++ b/tools/winebuild/utils.c
@@ -247,7 +247,6 @@ DLLSPEC *alloc_dll_spec(void)
     spec = xmalloc( sizeof(*spec) );
     spec->file_name          = NULL;
     spec->dll_name           = NULL;
-    spec->owner_name         = NULL;
     spec->init_func          = NULL;
     spec->type               = SPEC_WIN32;
     spec->base               = MAX_ORDINALS;
@@ -288,7 +287,6 @@ void free_dll_spec( DLLSPEC *spec )
     }
     free( spec->file_name );
     free( spec->dll_name );
-    free( spec->owner_name );
     free( spec->init_func );
     free( spec->entry_points );
     free( spec->names );