diff --git a/src/target/x86_32_common.c b/src/target/x86_32_common.c
index 2c60b9f7e0..8cca9a5e91 100644
--- a/src/target/x86_32_common.c
+++ b/src/target/x86_32_common.c
@@ -677,7 +677,7 @@ int x86_32_common_write_memory(struct target *t, target_addr_t addr,
 	return retval;
 }
 
-int x86_32_common_read_io(struct target *t, uint32_t addr,
+static int x86_32_common_read_io(struct target *t, uint32_t addr,
 			uint32_t size, uint8_t *buf)
 {
 	struct x86_32_common *x86_32 = target_to_x86_32(t);
diff --git a/src/target/x86_32_common.h b/src/target/x86_32_common.h
index 7392447a68..e232747697 100644
--- a/src/target/x86_32_common.h
+++ b/src/target/x86_32_common.h
@@ -309,8 +309,6 @@ int x86_32_common_read_memory(struct target *t, target_addr_t addr,
 			uint32_t size, uint32_t count, uint8_t *buf);
 int x86_32_common_write_memory(struct target *t, target_addr_t addr,
 			uint32_t size, uint32_t count, const uint8_t *buf);
-int x86_32_common_read_io(struct target *t, uint32_t addr,
-			uint32_t size, uint8_t *buf);
 int x86_32_common_write_io(struct target *t, uint32_t addr,
 			uint32_t size, const uint8_t *buf);
 int x86_32_common_add_breakpoint(struct target *t, struct breakpoint *bp);