diff --git a/src/ioc/PVAServerRegister.cpp b/src/ioc/PVAServerRegister.cpp
index fbee91f..6360914 100644
--- a/src/ioc/PVAServerRegister.cpp
+++ b/src/ioc/PVAServerRegister.cpp
@@ -46,7 +46,7 @@ void startitup() {
     the_server = pva::ServerContext::create(pva::ServerContext::Config()
                                             .config(pva::ConfigurationBuilder()
                                                     // default to all providers instead of just "local"
-                                                    .add("EPICS_PVAS_PROVIDER_NAMES", pva::PVACCESS_ALL_PROVIDERS)
+                                                    .add("EPICS_PVAS_PROVIDER_NAMES", PVACCESS_ALL_PROVIDERS)
                                                     .push_map()
                                                     // prefer to use EPICS_PVAS_PROVIDER_NAMES
                                                     // from environment
diff --git a/src/pva/pv/pvaConstants.h b/src/pva/pv/pvaConstants.h
index 14f2868..408d96f 100644
--- a/src/pva/pv/pvaConstants.h
+++ b/src/pva/pv/pvaConstants.h
@@ -73,13 +73,13 @@ const epics::pvData::int16 INVALID_DATA_TYPE = static_cast<epics::pvData::int16>
 const epics::pvData::int32 INVALID_IOID = 0;
 
 /** Default PVA provider name. */
-const std::string PVACCESS_DEFAULT_PROVIDER = "local";
+#define PVACCESS_DEFAULT_PROVIDER "local"
 
 /** "All-providers registered" PVA provider name. */
-const std::string PVACCESS_ALL_PROVIDERS = "<all>";
+#define PVACCESS_ALL_PROVIDERS "<all>"
 
 /** Name of the system env. variable to turn on debugging. */
-const std::string PVACCESS_DEBUG = "EPICS_PVA_DEBUG";
+#define PVACCESS_DEBUG "EPICS_PVA_DEBUG"
 }
 }