diff --git a/legacy/embryo/src/bin/embryo_cc_sc1.c b/legacy/embryo/src/bin/embryo_cc_sc1.c
index 734f6d10e5..8fc39ee7c7 100644
--- a/legacy/embryo/src/bin/embryo_cc_sc1.c
+++ b/legacy/embryo/src/bin/embryo_cc_sc1.c
@@ -173,7 +173,7 @@ sc_error(int number, char *message, char *filename, int firstline,
 void               *
 sc_opensrc(char *filename)
 {
-   return fopen(filename, "rt");
+   return fopen(filename, "rb");
 }
 
 void
@@ -215,7 +215,7 @@ sc_eofsrc(void *handle)
 void               *
 sc_openasm(char *filename)
 {
-   return fopen(filename, "w+t");
+   return fopen(filename, "w+");
 }
 
 void
diff --git a/legacy/embryo/src/bin/embryo_cc_sc5.c b/legacy/embryo/src/bin/embryo_cc_sc5.c
index a6062cc297..8118cbc9ff 100644
--- a/legacy/embryo/src/bin/embryo_cc_sc5.c
+++ b/legacy/embryo/src/bin/embryo_cc_sc5.c
@@ -100,7 +100,7 @@ error(int number, ...)
      {
 	FILE *fp;
 	
-	fp = fopen(errfname, "at");
+	fp = fopen(errfname, "a+");
 	if (fp != NULL)
 	  {
 	     if (errstart >= 0 && errstart != fline)