diff --git a/ui/win32/file_dlg_win32.cpp b/ui/win32/file_dlg_win32.cpp
index 53e6b92c4e..84f363a756 100644
--- a/ui/win32/file_dlg_win32.cpp
+++ b/ui/win32/file_dlg_win32.cpp
@@ -94,6 +94,7 @@ static GetThreadDpiAwarenessContextProc GetThreadDpiAwarenessContextP;
 static SetThreadDpiAwarenessContextProc SetThreadDpiAwarenessContextP;
 static gboolean got_proc_addresses = FALSE;
 
+DIAG_OFF(cast-function-type)
 static gboolean get_proc_addresses(void) {
     if (got_proc_addresses) return TRUE;
 
@@ -111,6 +112,7 @@ static gboolean get_proc_addresses(void) {
     got_proc_addresses = got_all;
     return got_all;
 }
+DIAG_ON(cast-function-type)
 
 // Enabling DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 causes issues
 // when dragging our open file dialog between differently-DPIed
diff --git a/wsutil/os_version_info.c b/wsutil/os_version_info.c
index ea727be77a..96185d4602 100644
--- a/wsutil/os_version_info.c
+++ b/wsutil/os_version_info.c
@@ -208,7 +208,9 @@ get_os_version_info(GString *str)
 
 	HMODULE ntdll_module = LoadLibrary(_T("ntdll.dll"));
 	if (ntdll_module) {
+DIAG_OFF(cast-function-type)
 		RtlGetVersionP = (RtlGetVersionProc) GetProcAddress(ntdll_module, "RtlGetVersion");
+DIAG_ON(cast-function-type)
 	}
 
 	if (RtlGetVersionP) {