diff --git a/api/boinc_api.cpp b/api/boinc_api.cpp
index 19835f2fdd..bb4a1d2925 100644
--- a/api/boinc_api.cpp
+++ b/api/boinc_api.cpp
@@ -1023,13 +1023,15 @@ int boinc_wu_cpu_time(double& cpu_t) {
 // Suspend this job.
 // Can be called from either timer or worker thread.
 //
-static int suspend_activities(bool called_from_worker) {
 #ifdef VERBOSE
+static int suspend_activities(bool called_from_worker) {
     char log_buf[256];
     fprintf(stderr, "%s suspend_activities() called from %s\n",
         boinc_msg_prefix(log_buf, sizeof(log_buf)),
         called_from_worker?"worker thread":"timer thread"
     );
+#else
+static int suspend_activities(bool) {
 #endif
 #ifdef _WIN32
     static vector<int> pids;
diff --git a/client/client_types.cpp b/client/client_types.cpp
index 2977ef7863..af1ab5a225 100644
--- a/client/client_types.cpp
+++ b/client/client_types.cpp
@@ -402,13 +402,13 @@ int FILE_INFO::parse(XML_PARSER& xp) {
             retval = pfxp->parse(xp);
 #ifdef SIM
             delete pfxp;
-            continue;
-#endif
+#else
             if (!retval) {
                 pers_file_xfer = pfxp;
             } else {
                 delete pfxp;
             }
+#endif
             continue;
         }
         if (xp.match_tag("file_xfer")) {
diff --git a/client/hostinfo_win.cpp b/client/hostinfo_win.cpp
index d4551f9034..7e5daa20b4 100644
--- a/client/hostinfo_win.cpp
+++ b/client/hostinfo_win.cpp
@@ -472,7 +472,7 @@ int get_os_information(
     }
 
 
-    snprintf_s( szVersion, sizeof(szVersion), ", (%.2u.%.2u.%.4u.%.2u)",
+    snprintf( szVersion, sizeof(szVersion), ", (%.2u.%.2u.%.4u.%.2u)",
         osvi.dwMajorVersion, osvi.dwMinorVersion, (osvi.dwBuildNumber & 0xFFFF), 0
     );
 
diff --git a/lib/boinc_stdio.h b/lib/boinc_stdio.h
index 77b8aefadd..0bde4272a7 100644
--- a/lib/boinc_stdio.h
+++ b/lib/boinc_stdio.h
@@ -75,8 +75,12 @@ namespace boinc {
     inline int fileno(FILE *f) {
 #ifdef _USING_FCGI_
         return FCGI_fileno(f);
+#else
+#ifdef _WIN32
+        return ::_fileno(f);
 #else
         return ::fileno(f);
+#endif
 #endif
     }
 
diff --git a/lib/boinc_win.h b/lib/boinc_win.h
index 0bde22a49e..e9a3f3ddc3 100644
--- a/lib/boinc_win.h
+++ b/lib/boinc_win.h
@@ -27,7 +27,7 @@
 
 #ifdef _MSC_VER
 #pragma warning(disable: 4996)  // deprecated function names
-#pragma warning(disable: 4127)  // constant conditional expression
+//#pragma warning(disable: 4127)  // constant conditional expression
 #pragma warning(disable: 4244)  // conversion from int to char
 #define chdir       _chdir
 #define finite      _finite
@@ -38,10 +38,6 @@
 #define stricmp     _stricmp
 #define strtime     _strtime
 #define unlink      _unlink
-#define snprintf_s  _snprintf_s
-#if _MSC_VER < 1900
-#define snprintf    _snprintf
-#endif
 #endif
 
 #ifdef __MINGW32__
diff --git a/lib/str_replace.h b/lib/str_replace.h
index d3b39b2785..21aecd71f4 100644
--- a/lib/str_replace.h
+++ b/lib/str_replace.h
@@ -1,6 +1,6 @@
 // This file is part of BOINC.
 // http://boinc.berkeley.edu
-// Copyright (C) 2008 University of California
+// Copyright (C) 2023 University of California
 //
 // BOINC is free software; you can redistribute it and/or modify it
 // under the terms of the GNU Lesser General Public License
@@ -56,11 +56,4 @@ inline int strcasecmp(const char* s1, const char* s2) {
 }
 #endif
 
-#ifdef _WIN32
-#define snprintf _snprintf
-    // Yucky!  _snprintf() is not the same as snprintf();
-    // it doesn't null-terminate if buffer is too small.
-    // This is a workaround until we switch to VS2015, which has sprintf()
-#endif
-
 #endif