diff --git a/libstdc++-v3/config/os/solaris/solaris2.7/bits/os_defines.h b/libstdc++-v3/config/os/solaris/solaris2.7/bits/os_defines.h
index 06f6c7268d2..67dae7a7770 100644
--- a/libstdc++-v3/config/os/solaris/solaris2.7/bits/os_defines.h
+++ b/libstdc++-v3/config/os/solaris/solaris2.7/bits/os_defines.h
@@ -45,7 +45,7 @@
 // Without this all the libio vtbls are offset wrongly.
 #define _G_USING_THUNKS 0
 
-#if defined(__sparc_v9) || defined(__arch64__)
+#if defined(__sparcv9) || defined(__arch64__)
 #define __glibcpp_long_bits 64
 #endif