diff --git a/src/arch/mips/stacktrace.hh b/src/arch/mips/stacktrace.hh
index f9e092dbd..c854f63ca 100644
--- a/src/arch/mips/stacktrace.hh
+++ b/src/arch/mips/stacktrace.hh
@@ -37,6 +37,9 @@
 class ThreadContext;
 class StackTrace;
 
+namespace MipsISA
+{
+
 class ProcessInfo
 {
   private:
@@ -118,4 +121,6 @@ StackTrace::trace(ThreadContext *tc, StaticInstPtr inst)
     return true;
 }
 
+}
+
 #endif // __ARCH_MIPS_STACKTRACE_HH__