diff --git a/src/preprocess.c b/src/preprocess.c
index 48661557..c08d1aeb 100644
--- a/src/preprocess.c
+++ b/src/preprocess.c
@@ -91,14 +91,15 @@ int main(int argc,char **argv)
     if (!d) DO_ERROR("opendir() failed");
     while((de=readdir(d))!=NULL) {
       if (strlen(de->d_name)>2) {
-	if (!strcmp(&de->d_name[strlen(de->d_name)-2],".s")) {
-	  if (strcmp(de->d_name,"combined.s")) {
-	    if (source_count>=MAX_FILES) DO_ERROR("Too many source files. Increase MAX_FILES?");
-	    source_files[source_count].file=strdup(de->d_name);
-	    source_files[source_count].address=-1;
-	    source_count++;
+	if (de->d_name[0]!='.'&&de->d_name[0]!='#') // ignore temp files etc
+	  if (!strcmp(&de->d_name[strlen(de->d_name)-2],".s")) {
+	    if (strcmp(de->d_name,"combined.s")) {
+	      if (source_count>=MAX_FILES) DO_ERROR("Too many source files. Increase MAX_FILES?");
+	      source_files[source_count].file=strdup(de->d_name);
+	      source_files[source_count].address=-1;
+	      source_count++;
+	    }
 	  }
-	}
       }
     }
     if (retVal) break;