diff --git a/src/config.c b/src/config.c
index 08508ae..d71259d 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1115,7 +1115,7 @@ static DWORD cfg_get_string(LPCSTR key, LPCSTR default_value, LPSTR out_string,
             else
             {
                 char section[MAX_PATH] = { 0 };
-                _snprintf(section, sizeof(section), "%s?%d", g_config.process_file_name, 2);
+                _snprintf(section, sizeof(section) - 1, "%s?%d", g_config.process_file_name, 2);
 
                 s = GetPrivateProfileStringA(section, key, "", out_string, out_size, g_config.ini_path);
 
@@ -1135,7 +1135,7 @@ static DWORD cfg_get_string(LPCSTR key, LPCSTR default_value, LPSTR out_string,
     else
     {
         char section[MAX_PATH] = { 0 };
-        _snprintf(section, sizeof(section), "%s/%d", g_config.process_file_name, 2);
+        _snprintf(section, sizeof(section) - 1, "%s/%d", g_config.process_file_name, 2);
 
         s = GetPrivateProfileStringA(section, key, "", out_string, out_size, g_config.ini_path);
 
@@ -1162,8 +1162,8 @@ static BOOL cfg_get_bool(LPCSTR key, BOOL default_value)
 
 static int cfg_get_int(LPCSTR key, int default_value)
 {
-    char def_value[20];
-    _snprintf(def_value, sizeof(def_value), "%d", default_value);
+    char def_value[24];
+    _snprintf(def_value, sizeof(def_value) - 1, "%d", default_value);
 
     char value[20];
     cfg_get_string(key, def_value, value, sizeof(value));
diff --git a/src/dllmain.c b/src/dllmain.c
index ed27aaa..bf6c556 100644
--- a/src/dllmain.c
+++ b/src/dllmain.c
@@ -58,7 +58,7 @@ BOOL WINAPI DllMain(HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
 
                     _snprintf(
                         mes,
-                        sizeof(mes),
+                        sizeof(mes) - 1,
                         "Please disable the '%s' compatibility mode for all game executables and "
                         "then try to start the game again.",
                         s);
diff --git a/src/render_gdi.c b/src/render_gdi.c
index c3f339f..bd88fb6 100644
--- a/src/render_gdi.c
+++ b/src/render_gdi.c
@@ -29,7 +29,7 @@ DWORD WINAPI gdi_render_main(void)
 
         _snprintf(
             warning_text, 
-            sizeof(warning_text),
+            sizeof(warning_text) - 1,
             "-WARNING- Using slow software rendering, please update your graphics card driver (%s)",
             strlen(g_oglu_version) > 10 ? "" : g_oglu_version);
     }
diff --git a/src/screenshot.c b/src/screenshot.c
index 4ad3cfc..d559101 100644
--- a/src/screenshot.c
+++ b/src/screenshot.c
@@ -150,7 +150,7 @@ BOOL ss_take_screenshot(IDirectDrawSurfaceImpl* src)
     CreateDirectoryA(g_config.screenshot_dir, NULL);
 
     strftime(str_time, sizeof(str_time), "%Y-%m-%d-%H_%M_%S", localtime(&t));
-    _snprintf(filename, sizeof(filename), "%s%s-%s.png", g_config.screenshot_dir, title, str_time);
+    _snprintf(filename, sizeof(filename) - 1, "%s%s-%s.png", g_config.screenshot_dir, title, str_time);
 
     if (src->bpp == 8 && src->palette)
     {