diff --git a/encoder.c b/encoder.c
index 618bc02..441b480 100644
--- a/encoder.c
+++ b/encoder.c
@@ -33,7 +33,7 @@ static const struct encoder_tuple table[] = {
 	{NULL, NULL}
 };
 
-const struct encoder_tuple *find_tuple(const char *text)
+static const struct encoder_tuple *find_tuple(const char *text)
 {
 	const struct encoder_tuple *walk = table;
 
diff --git a/main.c b/main.c
index a8adc69..87ebf93 100644
--- a/main.c
+++ b/main.c
@@ -14,7 +14,7 @@
 #define FLAG_ENCODE	1 << 2
 
 
-const char *usage_str =
+static const char *usage_str =
 	"iast, a sanskrit transliteration helper.\n"
 	"\n"
 	"usage:\n"