diff --git a/src/twn_loop.c b/src/twn_loop.c
index 43e94ce..c562d37 100644
--- a/src/twn_loop.c
+++ b/src/twn_loop.c
@@ -613,9 +613,9 @@ static bool initialize(void) {
         if (!datum_font_filtering.ok) {
             ctx.font_filtering = TEXT_FONT_FILTERING_DEFAULT;
         } else {
-            if (SDL_strncmp(datum_font_filtering.u.s, "nearest", sizeof "nearest") == 0) {
+            if (SDL_strncmp(datum_font_filtering.u.s, "nearest", sizeof "nearest" - 1) == 0) {
                 ctx.font_filtering = TEXTURE_FILTER_NEAREAST;
-            } else if (SDL_strncmp(datum_font_filtering.u.s, "linear", sizeof "nearest") == 0) {
+            } else if (SDL_strncmp(datum_font_filtering.u.s, "linear", sizeof "linear" - 1) == 0) {
                 ctx.font_filtering = TEXTURE_FILTER_LINEAR;
             } else {
                 ctx.font_filtering = TEXT_FONT_FILTERING_DEFAULT;