diff --git a/igzip/igzip.c b/igzip/igzip.c
index 01fcb0b..7808640 100644
--- a/igzip/igzip.c
+++ b/igzip/igzip.c
@@ -98,11 +98,10 @@ void isal_deflate_icf_finish(struct isal_zstream *stream);
 
 /* Forward declarations */
 static inline void reset_match_history(struct isal_zstream *stream);
-void write_header(struct isal_zstream *stream, uint8_t * deflate_hdr,
-		  uint32_t deflate_hdr_count, uint32_t extra_bits_count, uint32_t next_state,
-		  uint32_t toggle_end_of_stream);
-void write_deflate_header(struct isal_zstream *stream);
-void write_trailer(struct isal_zstream *stream);
+static void write_header(struct isal_zstream *stream, uint8_t * deflate_hdr,
+			 uint32_t deflate_hdr_count, uint32_t extra_bits_count,
+			 uint32_t next_state, uint32_t toggle_end_of_stream);
+static void write_trailer(struct isal_zstream *stream);
 
 struct slver {
 	uint16_t snum;
@@ -1288,9 +1287,9 @@ static int write_deflate_header_unaligned_stateless(struct isal_zstream *stream)
 }
 
 /* Toggle end of stream only works when deflate header is aligned */
-void write_header(struct isal_zstream *stream, uint8_t * deflate_hdr,
-		  uint32_t deflate_hdr_count, uint32_t extra_bits_count,
-		  uint32_t next_state, uint32_t toggle_end_of_stream)
+static void write_header(struct isal_zstream *stream, uint8_t * deflate_hdr,
+			 uint32_t deflate_hdr_count, uint32_t extra_bits_count,
+			 uint32_t next_state, uint32_t toggle_end_of_stream)
 {
 	struct isal_zstate *state = &stream->internal_state;
 	uint32_t hdr_extra_bits = deflate_hdr[deflate_hdr_count];
@@ -1354,7 +1353,7 @@ void write_header(struct isal_zstream *stream, uint8_t * deflate_hdr,
 
 }
 
-void write_trailer(struct isal_zstream *stream)
+static void write_trailer(struct isal_zstream *stream)
 {
 	struct isal_zstate *state = &stream->internal_state;
 	unsigned int bytes = 0;
diff --git a/igzip/igzip_inflate.c b/igzip/igzip_inflate.c
index 3538f89..d8b9e13 100644
--- a/igzip/igzip_inflate.c
+++ b/igzip/igzip_inflate.c
@@ -832,7 +832,7 @@ static int inline setup_dynamic_header(struct inflate_state *state)
 
 /* Reads in the header pointed to by in_stream and sets up state to reflect that
  * header information*/
-int read_header(struct inflate_state *state)
+static int read_header(struct inflate_state *state)
 {
 	uint8_t bytes;
 	uint32_t btype;
@@ -895,7 +895,7 @@ int read_header(struct inflate_state *state)
 
 /* Reads in the header pointed to by in_stream and sets up state to reflect that
  * header information*/
-int read_header_stateful(struct inflate_state *state)
+static int read_header_stateful(struct inflate_state *state)
 {
 	uint64_t read_in_start = state->read_in;
 	int32_t read_in_length_start = state->read_in_length;