diff --git a/include/boost/detail/sp_counted_base.hpp b/include/boost/detail/sp_counted_base.hpp
index 0c61fdd..2c9df7e 100644
--- a/include/boost/detail/sp_counted_base.hpp
+++ b/include/boost/detail/sp_counted_base.hpp
@@ -23,6 +23,10 @@
 
 # include <boost/detail/sp_counted_base_nt.hpp>
 
+#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
+
+# include <boost/detail/sp_counted_base_gcc_x86.hpp>
+
 #elif defined( WIN32 ) || defined( _WIN32 ) || defined( __WIN32__ )
 
 # include <boost/detail/sp_counted_base_w32.hpp>
diff --git a/include/boost/detail/sp_counted_base_gcc_x86.hpp b/include/boost/detail/sp_counted_base_gcc_x86.hpp
index 18fd1e9..54ab199 100644
--- a/include/boost/detail/sp_counted_base_gcc_x86.hpp
+++ b/include/boost/detail/sp_counted_base_gcc_x86.hpp
@@ -85,9 +85,9 @@ inline long atomic_conditional_increment( long * pw )
         "cmpxchgl %%ebx, %0\n\t"
         "jne 0b\n\t"
         "1:":
-        "=m"( *pw ), "=&eax"( r ): // outputs (%0, %1)
+        "=m"( *pw ), "=&%eax"( r ): // outputs (%0, %1)
         "m"( *pw ): // input (%2)
-        "ebx", "memory", "cc" // clobbers
+        "%ebx", "memory", "cc" // clobbers
     );
 
     return r;