diff --git a/fdbrpc/SimExternalConnection.actor.cpp b/fdbrpc/SimExternalConnection.actor.cpp
index d44bdec8be..a9de15edba 100644
--- a/fdbrpc/SimExternalConnection.actor.cpp
+++ b/fdbrpc/SimExternalConnection.actor.cpp
@@ -18,6 +18,9 @@
  * limitations under the License.
  */
 
+#define BOOST_SYSTEM_NO_LIB
+#define BOOST_DATE_TIME_NO_LIB
+#define BOOST_REGEX_NO_LIB
 #include <boost/asio.hpp>
 #include <boost/range.hpp>
 #include <thread>
@@ -32,8 +35,6 @@
 
 using namespace boost::asio;
 
-#define BOOST_DATE_TIME_NO_LIB
-
 static io_service ios;
 
 class SimExternalConnectionImpl {
diff --git a/fdbrpc/sim2.actor.cpp b/fdbrpc/sim2.actor.cpp
index 22079324e4..cbb6c81c8c 100644
--- a/fdbrpc/sim2.actor.cpp
+++ b/fdbrpc/sim2.actor.cpp
@@ -24,6 +24,9 @@
 #include <vector>
 
 #include "fdbrpc/simulator.h"
+#define BOOST_SYSTEM_NO_LIB
+#define BOOST_DATE_TIME_NO_LIB
+#define BOOST_REGEX_NO_LIB
 #include "fdbrpc/SimExternalConnection.h"
 #include "flow/ActorCollection.h"
 #include "flow/IRandom.h"
@@ -46,8 +49,6 @@
 #include "fdbrpc/AsyncFileWriteChecker.h"
 #include "flow/actorcompiler.h"  // This must be the last #include.
 
-#define BOOST_DATE_TIME_NO_LIB
-
 bool simulator_should_inject_fault( const char* context, const char* file, int line, int error_code ) {
 	if (!g_network->isSimulated()) return false;