diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 1a8cca33b736a83823b87dbc94f108f0231651a9..8002e9ce25fca1552fb15d43c3356b86b05682b6 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -64,7 +64,7 @@ static inline bool use_xsave(void)
 	alternative_io("mov $0, %0",
 		       "mov $1, %0",
 		       X86_FEATURE_XSAVE,
-		       "=g"(has_xsave));
+		       "=qm" (has_xsave));
 
 	return has_xsave;
 }