diff --git a/mm/shm/shm.h b/mm/shm/shm.h
index 6d55167ef2..02d9a0281d 100644
--- a/mm/shm/shm.h
+++ b/mm/shm/shm.h
@@ -36,8 +36,6 @@
 #include <nuttx/addrenv.h>
 #include <nuttx/mutex.h>
 
-#ifdef CONFIG_MM_SHM
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -143,5 +141,4 @@ extern struct shm_info_s g_shminfo;
 
 void shm_destroy(int shmid);
 
-#endif /* CONFIG_MM_SHM */
 #endif /* __MM_SHM_SHM_H */
diff --git a/mm/shm/shmat.c b/mm/shm/shmat.c
index a6b08d210c..73dbfe789a 100644
--- a/mm/shm/shmat.c
+++ b/mm/shm/shmat.c
@@ -39,8 +39,6 @@
 #include "sched/sched.h"
 #include "shm/shm.h"
 
-#ifdef CONFIG_MM_SHM
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -309,4 +307,3 @@ errout_with_ret:
   return (FAR void *)ERROR;
 }
 
-#endif /* CONFIG_MM_SHM */
diff --git a/mm/shm/shmctl.c b/mm/shm/shmctl.c
index 01e1342465..3ffa9e1081 100644
--- a/mm/shm/shmctl.c
+++ b/mm/shm/shmctl.c
@@ -40,8 +40,6 @@
 
 #include "shm/shm.h"
 
-#ifdef CONFIG_MM_SHM
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -249,4 +247,3 @@ void shm_destroy(int shmid)
   memset(region, 0, sizeof(struct shm_region_s));
 }
 
-#endif /* CONFIG_MM_SHM */
diff --git a/mm/shm/shmdt.c b/mm/shm/shmdt.c
index 073e0f925e..41aead6059 100644
--- a/mm/shm/shmdt.c
+++ b/mm/shm/shmdt.c
@@ -39,8 +39,6 @@
 #include "sched/sched.h"
 #include "shm/shm.h"
 
-#ifdef CONFIG_MM_SHM
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -114,4 +112,3 @@ int shmdt(FAR const void *shmaddr)
   return ret;
 }
 
-#endif /* CONFIG_MM_SHM */
diff --git a/mm/shm/shmget.c b/mm/shm/shmget.c
index 857c4fe792..fb90d1d68f 100644
--- a/mm/shm/shmget.c
+++ b/mm/shm/shmget.c
@@ -38,8 +38,6 @@
 
 #include "shm/shm.h"
 
-#ifdef CONFIG_MM_SHM
-
 /****************************************************************************
  * Public Data
  ****************************************************************************/
@@ -483,4 +481,3 @@ errout:
   return ERROR;
 }
 
-#endif /* CONFIG_MM_SHM */