diff --git a/libtcc.c b/libtcc.c
index ec33591a..e209a19e 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -1082,7 +1082,9 @@ LIBTCCAPI int tcc_add_file(TCCState *s, const char *filename)
                 filetype = AFF_TYPE_ASMPP;
             else if (!strcmp(ext, "s"))
                 filetype = AFF_TYPE_ASM;
-            else if (!PATHCMP(ext, "c") || !PATHCMP(ext, "i"))
+            else if (!PATHCMP(ext, "c")
+                     || !PATHCMP(ext, "h")
+                     || !PATHCMP(ext, "i"))
                 filetype = AFF_TYPE_C;
             else
                 filetype |= AFF_TYPE_BIN;