diff --git a/igzip/igzip_base.c b/igzip/igzip_base.c
index 3519c36..bcc965f 100644
--- a/igzip/igzip_base.c
+++ b/igzip/igzip_base.c
@@ -35,7 +35,7 @@ void isal_deflate_body_base(struct isal_zstream *stream)
 	uint64_t code, code_len, code2, code_len2;
 	struct isal_zstate *state = &stream->internal_state;
 	uint16_t *last_seen = state->head;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hist_size = state->dist_mask;
 	uint32_t hash_mask = state->hash_mask;
 
@@ -123,7 +123,7 @@ void isal_deflate_finish_base(struct isal_zstream *stream)
 	uint64_t code, code_len, code2, code_len2;
 	struct isal_zstate *state = &stream->internal_state;
 	uint16_t *last_seen = state->head;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hist_size = state->dist_mask;
 	uint32_t hash_mask = state->hash_mask;
 
diff --git a/igzip/igzip_icf_base.c b/igzip/igzip_icf_base.c
index a75b7b3..1f03179 100644
--- a/igzip/igzip_icf_base.c
+++ b/igzip/igzip_icf_base.c
@@ -44,7 +44,7 @@ void isal_deflate_icf_body_hash_hist_base(struct isal_zstream *stream)
 	struct isal_zstate *state = &stream->internal_state;
 	struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
 	uint16_t *last_seen = level_buf->hash_hist.hash_table;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hist_size = state->dist_mask;
 	uint32_t hash_mask = state->hash_mask;
 
@@ -141,7 +141,7 @@ void isal_deflate_icf_finish_hash_hist_base(struct isal_zstream *stream)
 	struct isal_zstate *state = &stream->internal_state;
 	struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
 	uint16_t *last_seen = level_buf->hash_hist.hash_table;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hist_size = state->dist_mask;
 	uint32_t hash_mask = state->hash_mask;
 
@@ -252,7 +252,7 @@ void isal_deflate_icf_finish_hash_map_base(struct isal_zstream *stream)
 	struct isal_zstate *state = &stream->internal_state;
 	struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
 	uint16_t *last_seen = level_buf->hash_map.hash_table;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hist_size = state->dist_mask;
 	uint32_t hash_mask = state->hash_mask;
 
diff --git a/igzip/igzip_icf_body.c b/igzip/igzip_icf_body.c
index 375d4d4..5d57232 100644
--- a/igzip/igzip_icf_body.c
+++ b/igzip/igzip_icf_body.c
@@ -77,7 +77,7 @@ uint64_t gen_icf_map_h1_base(struct isal_zstream *stream,
 
 	uint32_t dist, len, extra_bits;
 	uint8_t *next_in = stream->next_in, *end_in = stream->next_in + input_size;
-	uint8_t *file_start = stream->next_in - stream->total_in;
+	uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
 	uint32_t hash;
 	uint64_t next_bytes, match_bytes;
 	uint64_t match;