diff --git a/src/bin/termptyesc.c b/src/bin/termptyesc.c
index 43ac5c32..1014ab2f 100644
--- a/src/bin/termptyesc.c
+++ b/src/bin/termptyesc.c
@@ -77,8 +77,8 @@ static const char *const ASCII_CHARS_TABLE[] =
    "US"   // '\037'
 };
 
-static const char *
-_safechar(unsigned int c)
+static const char * EINA_PURE
+_safechar(const unsigned int c)
 {
    static char _str[9];