diff --git a/test/regress/test.hpp b/test/regress/test.hpp
index c4840aaf..712abd4a 100644
--- a/test/regress/test.hpp
+++ b/test/regress/test.hpp
@@ -221,7 +221,9 @@ void test_unicode();
 // template instances:
 // we pretty much have to instantiate these separately
 // otherwise compilation times are really excessive...
+// Unfortunately this doesn't work with SunPro:
 //
+#ifndef __SUNPRO_CC
 #ifndef BOOST_REGEX_TEST_INSTANCES
 #define template template<>
 #endif
@@ -239,5 +241,6 @@ template void test<wchar_t, test_invalid_regex_tag>(const wchar_t&, const test_i
 #ifndef BOOST_REGEX_TEST_INSTANCES
 #undef template
 #endif
+#endif
 
 #endif