diff --git a/src/base/gtest/logging.hh b/src/base/gtest/logging.hh
index 12d4e5afb4..1d5a39c6bb 100644
--- a/src/base/gtest/logging.hh
+++ b/src/base/gtest/logging.hh
@@ -32,6 +32,14 @@
 namespace gem5
 {
 
+// This custom exception type will help prevent fatal exceptions from being
+// caught by other code in gem5 and let them escape to the gtest framework.
+// Unfortunately that results in a somewhat confusing message about an unknown
+// exception being thrown after the panic/fatal message has been printed, but
+// there will at least be some indication what went wrong.
+struct GTestException
+{};
+
 class GTestLogOutput : public std::ostringstream
 {
   private:
diff --git a/src/base/gtest/logging_mock.cc b/src/base/gtest/logging_mock.cc
index 101374eecc..07a20ea1ec 100644
--- a/src/base/gtest/logging_mock.cc
+++ b/src/base/gtest/logging_mock.cc
@@ -36,14 +36,6 @@ namespace gem5
 
 namespace {
 
-// This custom exception type will help prevent fatal exceptions from being
-// caught by other code in gem5 and let them escape to the gtest framework.
-// Unfortunately that results in a somewhat confusing message about an unknown
-// exception being thrown after the panic/fatal message has been printed, but
-// there will at least be some indication what went wrong.
-struct GTestException
-{};
-
 class GTestLogger : public Logger
 {
   public: