--- a/g15daemon/utility_funcs.c
+++ b/g15daemon/utility_funcs.c
@@ -666,12 +666,24 @@
 }
 
 int uf_screendump_pbm(unsigned char *buffer,char *filename) {
+    int fd;
     FILE *f;
     int x,y;
     #define WIDTH 40
     g15canvas *canvas=g15daemon_xmalloc(sizeof(g15canvas));
     memcpy(canvas->buffer,buffer,LCD_BUFSIZE);
-    f = fopen(filename,"w+");
+    fd = open(filename, O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+    if(fd == -1) {
+       g15daemon_log(LOG_WARNING, "uf_screendump_pbm failed: open, %s.\n", strerror(errno));
+       return -1;
+    }
+    f = fdopen(fd,"w");
+    if(f==NULL) {
+       close(fd);
+        g15daemon_log(LOG_WARNING, "uf_screendump_pbm failed: fdopen, %s.\n", strerror(errno));
+        return -1;
+    }
+
     fprintf(f,"P1\n160 43\n");
     fprintf(f,"# G15 screendump - %s\n\n",filename);
     for(y=0;y<43;y++)
@@ -681,7 +693,9 @@
               fprintf(f,"\n");
         }
 
-        fclose(f);
+    fclose(f);
+    fsync(fd);
+    close(fd);
     free(canvas);
     return 0;
 }