diff --git a/example/calendar.cpp b/example/calendar.cpp
index e91c5828..522506d8 100644
--- a/example/calendar.cpp
+++ b/example/calendar.cpp
@@ -29,8 +29,8 @@ constexpr auto max_weeks_in_month = 6;
 constexpr auto col_sep = "  ";
 constexpr auto row_sep = ' ';
 
-// Workaround: libc++17 does not support C++20 chrono::time_point::operator++
-#if defined _LIBCPP_VERSION and _LIBCPP_VERSION < 180000
+// Workaround: libc++18 does not support C++20 chrono::time_point::operator++
+#if defined _LIBCPP_VERSION and _LIBCPP_VERSION < 190000
 namespace std::chrono {
     sys_days& operator++(sys_days& d) {
         return d += days{1};
diff --git a/module/CMakeLists.txt b/module/CMakeLists.txt
index 0203601b..c7b12142 100644
--- a/module/CMakeLists.txt
+++ b/module/CMakeLists.txt
@@ -17,10 +17,3 @@ target_sources(flux-mod PUBLIC
 target_link_libraries(flux-mod PRIVATE flux)
 target_compile_features(flux-mod PUBLIC $<IF:$<CXX_COMPILER_ID:MSVC>,cxx_std_23,cxx_std_20>)
 set_target_properties(flux-mod PROPERTIES CXX_EXTENSIONS Off)
-
-# Squish MSVC warning when building the module, hopefully we're not actually doing anything wrong
-if(MSVC)
-    target_compile_options(flux-mod PRIVATE
-        /wd5244 # '#include <flux.hpp>' in the purview of module 'flux' appears erroneous
-    )
-endif()
\ No newline at end of file
diff --git a/module/flux.cpp b/module/flux.cpp
index f63737a0..0c22215c 100644
--- a/module/flux.cpp
+++ b/module/flux.cpp
@@ -33,4 +33,26 @@ export module flux;
 
 #define FLUX_MODULE_INTERFACE
 
+// Silence Clang and MSVC warnings about #include inside a module's purview
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 5244)
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#if __has_warning("-Winclude-angled-in-module-purview")
+#pragma clang diagnostic ignored "-Winclude-angled-in-module-purview"
+#endif
+#endif
+
 #include <flux.hpp>
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 960cabd5..7f7e58b0 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -112,13 +112,6 @@ if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.28.0")
 
         target_compile_definitions(test-flux PRIVATE -DUSE_MODULES)
         set_target_properties(test-flux PROPERTIES CXX_SCAN_FOR_MODULES On)
-
-        # Squish MSVC warning when building the module, hopefully we're not actually doing anything wrong
-        if(MSVC)
-            target_compile_options(test-flux PRIVATE
-                    /wd5244 # '#include <flux.hpp>' in the purview of module 'flux' appears erroneous
-            )
-        endif()
     endif()
 endif()