diff -Nrup a/src/u_deep.c b/src/u_deep.c
--- a/src/u_deep.c	2006-06-25 09:30:30.000000000 -0600
+++ b/src/u_deep.c	2019-10-15 13:54:07.360163470 -0600
@@ -17,9 +17,9 @@
 #include "getbits.h"
 
 
-INLINE USHORT DecodeChar(void);
-INLINE USHORT DecodePosition(void);
-INLINE void update(USHORT c);
+static INLINE USHORT DecodeChar(void);
+static INLINE USHORT DecodePosition(void);
+static INLINE void update(USHORT c);
 static void reconst(void);
 
 
@@ -98,7 +98,7 @@ USHORT Unpack_DEEP(UCHAR *in, UCHAR *out
 
 
 
-INLINE USHORT DecodeChar(void){
+static INLINE USHORT DecodeChar(void){
 	USHORT c;
 
 	c = son[R];
@@ -117,7 +117,7 @@ INLINE USHORT DecodeChar(void){
 
 
 
-INLINE USHORT DecodePosition(void){
+static INLINE USHORT DecodePosition(void){
 	USHORT i, j, c;
 
 	i = GETBITS(8);  DROPBITS(8);
@@ -171,7 +171,7 @@ static void reconst(void){
 
 /* increment frequency of given code by one, and update tree */
 
-INLINE void update(USHORT c){
+static INLINE void update(USHORT c){
 	USHORT i, j, k, l;
 
 	if (freq[R] == MAX_FREQ) {
diff -Nrup a/src/u_heavy.c b/src/u_heavy.c
--- a/src/u_heavy.c	2006-06-25 09:30:30.000000000 -0600
+++ b/src/u_heavy.c	2019-10-15 13:53:03.543524151 -0600
@@ -30,8 +30,8 @@ USHORT heavy_text_loc;
 
 static USHORT read_tree_c(void);
 static USHORT read_tree_p(void);
-INLINE USHORT decode_c(void);
-INLINE USHORT decode_p(void);
+static INLINE USHORT decode_c(void);
+static INLINE USHORT decode_p(void);
 
 
 
@@ -74,7 +74,7 @@ USHORT Unpack_HEAVY(UCHAR *in, UCHAR *ou
 
 
 
-INLINE USHORT decode_c(void){
+static INLINE USHORT decode_c(void){
 	USHORT i, j, m;
 
 	j = c_table[GETBITS(12)];
@@ -96,7 +96,7 @@ INLINE USHORT decode_c(void){
 
 
 
-INLINE USHORT decode_p(void){
+static INLINE USHORT decode_p(void){
 	USHORT i, j, m;
 
 	j = pt_table[GETBITS(8)];