--- a/source/utils/owrt_smbpasswd.c	2017-10-03 15:57:24.190827000 +0100
+++ a/source/utils/owrt_smbpasswd.c	2017-10-03 16:07:54.862857000 +0100
@@ -108,7 +108,7 @@
 		}
 	}
 
-	fprintf(fp, line);
+	fprintf(fp, "%s", line);
 
 out:
 	if(fp)
@@ -134,20 +134,20 @@
 			p = strchr(t, ':');
 			if(p && (p - t == strlen(user)) && (strncmp(t, user, strlen(user))) == 0)
 			{
-				fpos_t r_pos, w_pos;
+				long int r_pos, w_pos;
 				char t2[256];
-				fgetpos(fp, &r_pos);
+				r_pos = ftell(fp);
 				w_pos = r_pos;
-				w_pos.__pos -= strlen(t);
+				w_pos -= strlen(t);
 				while(fgets(t2, 256, fp))
 				{
-					fsetpos(fp, &w_pos);
+					fseek(fp, w_pos, SEEK_SET);
 					fputs(t2, fp);
-					r_pos.__pos += strlen(t2);
-					w_pos.__pos += strlen(t2);
-					fsetpos(fp, &r_pos);
+					r_pos += strlen(t2);
+					w_pos += strlen(t2);
+					fseek(fp, r_pos, SEEK_SET);
 				}
-				ftruncate(fileno(fp), w_pos.__pos);
+				ftruncate(fileno(fp), w_pos);
 				break;
 			}
 		}