diff --git a/src/rcore.c b/src/rcore.c
index dbdec801d..7acedf6c2 100644
--- a/src/rcore.c
+++ b/src/rcore.c
@@ -2842,7 +2842,7 @@ bool IsFileExtension(const char *fileName, const char *ext)
         int extCount = 0;
         const char **checkExts = TextSplit(ext, ';', &extCount);  // WARNING: Module required: rtext
 
-        char fileExtLower[MAX_FILE_EXTENSION_SIZE] = { 0 };
+        char fileExtLower[MAX_FILE_EXTENSION_SIZE + 1] = { 0 };
         strncpy(fileExtLower, TextToLower(fileExt),MAX_FILE_EXTENSION_SIZE);  // WARNING: Module required: rtext
 
         for (int i = 0; i < extCount; i++)