diff --git a/gcc/config/i386/osfrose.h b/gcc/config/i386/osfrose.h
index 400e98610e4..e041e12971b 100644
--- a/gcc/config/i386/osfrose.h
+++ b/gcc/config/i386/osfrose.h
@@ -184,9 +184,11 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    enclosed in `extern "C" {...}'. */
 #define NO_IMPLICIT_EXTERN_C
 
+#ifdef NO_LONG_DOUBLE
 /* Turn off long double being 96 bits.  */
 #undef LONG_DOUBLE_TYPE_SIZE
 #define LONG_DOUBLE_TYPE_SIZE 64
+#endif
 
 /* This macro generates the assembly code for function entry.
    FILE is a stdio stream to output the code to.