diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e31da3e..46580ce3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,9 @@ if(PACKAGING)
   add_definitions(-DPKG=1)
 endif()
 
+#c++20 removed std::result_of but boost 1.75 is still using it.
+add_definitions(-DBOOST_ASIO_HAS_STD_INVOKE_RESULT=1)
+
 add_library(clio)
 target_compile_features(clio PUBLIC cxx_std_20)
 target_include_directories(clio PUBLIC src)
diff --git a/src/backend/BackendInterface.h b/src/backend/BackendInterface.h
index 7ad6693e..33098249 100644
--- a/src/backend/BackendInterface.h
+++ b/src/backend/BackendInterface.h
@@ -111,7 +111,7 @@ synchronous(F&& f)
      * R is the currently executing coroutine that is about to get passed.
      * If corountine types do not match, the current one's type is stored.
      */
-    using R = typename std::result_of<F(boost::asio::yield_context&)>::type;
+    using R = typename boost::result_of<F(boost::asio::yield_context&)>::type;
     if constexpr (!std::is_same<R, void>::value)
     {
         /**
diff --git a/src/rpc/RPC.cpp b/src/rpc/RPC.cpp
index 35ae1e73..32e13a98 100644
--- a/src/rpc/RPC.cpp
+++ b/src/rpc/RPC.cpp
@@ -178,7 +178,7 @@ public:
     {
         for (auto const& handler : handlers)
         {
-            handlerMap_[handler.method] = move(handler);
+            handlerMap_[handler.method] = std::move(handler);
         }
     }
 
diff --git a/unittests/Backend.cpp b/unittests/Backend.cpp
index 69581347..837878a5 100644
--- a/unittests/Backend.cpp
+++ b/unittests/Backend.cpp
@@ -988,7 +988,6 @@ TEST_F(BackendTest, Basic)
 
                     Backend::LedgerPage page;
                     std::vector<Backend::LedgerObject> retObjs;
-                    size_t numLoops = 0;
                     do
                     {
                         uint32_t limit = 10;
@@ -1000,7 +999,6 @@ TEST_F(BackendTest, Basic)
                             retObjs.end(),
                             page.objects.begin(),
                             page.objects.end());
-                        ++numLoops;
                     } while (page.cursor);
 
                     for (auto obj : objs)
@@ -2343,7 +2341,6 @@ TEST_F(BackendTest, cacheIntegration)
                     }
                     Backend::LedgerPage page;
                     std::vector<Backend::LedgerObject> retObjs;
-                    size_t numLoops = 0;
                     do
                     {
                         uint32_t limit = 10;
@@ -2355,7 +2352,6 @@ TEST_F(BackendTest, cacheIntegration)
                             retObjs.end(),
                             page.objects.begin(),
                             page.objects.end());
-                        ++numLoops;
                     } while (page.cursor);
                     for (auto obj : objs)
                     {
diff --git a/unittests/backend/cassandra/BackendTests.cpp b/unittests/backend/cassandra/BackendTests.cpp
index b268d76f..8e1225e6 100644
--- a/unittests/backend/cassandra/BackendTests.cpp
+++ b/unittests/backend/cassandra/BackendTests.cpp
@@ -893,7 +893,6 @@ TEST_F(BackendCassandraTest, Basic)
 
                     Backend::LedgerPage page;
                     std::vector<Backend::LedgerObject> retObjs;
-                    size_t numLoops = 0;
                     do
                     {
                         uint32_t limit = 10;
@@ -903,7 +902,6 @@ TEST_F(BackendCassandraTest, Basic)
                             retObjs.end(),
                             page.objects.begin(),
                             page.objects.end());
-                        ++numLoops;
                     } while (page.cursor);
 
                     for (auto obj : objs)
@@ -1544,7 +1542,6 @@ TEST_F(BackendCassandraTest, CacheIntegration)
                 }
                 Backend::LedgerPage page;
                 std::vector<Backend::LedgerObject> retObjs;
-                size_t numLoops = 0;
                 do
                 {
                     uint32_t limit = 10;
@@ -1554,7 +1551,6 @@ TEST_F(BackendCassandraTest, CacheIntegration)
                         retObjs.end(),
                         page.objects.begin(),
                         page.objects.end());
-                    ++numLoops;
                 } while (page.cursor);
                 for (auto obj : objs)
                 {