diff --git a/GUI/xephem/compiler.c b/GUI/xephem/compiler.c
index 63a0065..16bf565 100644
--- a/GUI/xephem/compiler.c
+++ b/GUI/xephem/compiler.c
@@ -208,7 +208,7 @@ next_token ()
 {
 	static char toomv[] = "More than %d variables";
 	static char toomc[] = "More than %d constants";
-	static char badop[] = "Illegal operator";
+	static const char badop[] = "Illegal operator";
 	int tok = ERR;	/* just something illegal */
 	char c;
 
diff --git a/GUI/xephem/tools/lx200xed/lx200xed.c b/GUI/xephem/tools/lx200xed/lx200xed.c
index 34bdb33..4c6e5b0 100644
--- a/GUI/xephem/tools/lx200xed/lx200xed.c
+++ b/GUI/xephem/tools/lx200xed/lx200xed.c
@@ -657,7 +657,7 @@ trace(int iLevel, char *szpFormat, char *szpArg)
 {
    if(iLevel<=config.iTrace) {
       if(szpArg==NULL)
-	printf(szpFormat);
+	printf("%s", szpFormat);
       else
 	printf(szpFormat,szpArg);
    }