diff --git a/boards/arm/stm32f7/nucleo-144/configs/f746-pysim/defconfig b/boards/arm/stm32f7/nucleo-144/configs/f746-pysim/defconfig
index 0c570032f8..91c62c486c 100644
--- a/boards/arm/stm32f7/nucleo-144/configs/f746-pysim/defconfig
+++ b/boards/arm/stm32f7/nucleo-144/configs/f746-pysim/defconfig
@@ -34,7 +34,6 @@ CONFIG_DEV_GPIO=y
 CONFIG_ETH0_PHY_LAN8742A=y
 CONFIG_FS_PROCFS=y
 CONFIG_FS_PROCFS_EXCLUDE_ENVIRON=y
-CONFIG_FS_PROCFS_MAX_TASKS=16
 CONFIG_FS_PROCFS_REGISTER=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
diff --git a/fs/procfs/Kconfig b/fs/procfs/Kconfig
index 77aa1d2f5e..b06e4313ff 100644
--- a/fs/procfs/Kconfig
+++ b/fs/procfs/Kconfig
@@ -21,12 +21,6 @@ config FS_PROCFS_REGISTER
 		Support run-time registration of the new entries in the procfs file
 		system.
 
-config FS_PROCFS_MAX_TASKS
-	int "The maximum number of active tasks for procfs snapshot"
-	default 128
-	---help---
-		The maximum number of active tasks for procfs snapshot.
-
 menu "Exclude individual procfs entries"
 
 config FS_PROCFS_EXCLUDE_BLOCKS
diff --git a/fs/procfs/fs_procfs.c b/fs/procfs/fs_procfs.c
index 50381b7190..abf9b0673f 100644
--- a/fs/procfs/fs_procfs.c
+++ b/fs/procfs/fs_procfs.c
@@ -47,6 +47,7 @@
 #include <nuttx/fs/procfs.h>
 
 #include "mount/mount.h"
+#include "sched/sched.h"
 
 /****************************************************************************
  * External Definitions
@@ -315,8 +316,8 @@ struct procfs_level0_s
   /* Our private data */
 
   uint8_t lastlen;                       /* length of last reported static dir */
-  pid_t pid[CONFIG_FS_PROCFS_MAX_TASKS]; /* Snapshot of all active task IDs */
   FAR const char *lastread;              /* Pointer to last static dir read */
+  pid_t pid[1];                          /* Snapshot of all active task IDs */
 };
 
 /* Level 1 is an internal virtual directory (such as /proc/fs) which
@@ -355,14 +356,14 @@ static void procfs_enum(FAR struct tcb_s *tcb, FAR void *arg)
 
   /* Add the PID to the list */
 
-  index = dir->base.nentries;
-  if (index >= CONFIG_FS_PROCFS_MAX_TASKS)
+  if (dir->base.index >= dir->base.nentries)
     {
       return;
     }
 
+  index = dir->base.index;
   dir->pid[index] = tcb->pid;
-  dir->base.nentries = index + 1;
+  dir->base.index = index + 1;
 }
 
 /****************************************************************************
@@ -633,12 +634,18 @@ static int procfs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
 
   if (!relpath || relpath[0] == '\0')
     {
+      size_t num = 0;
+
       /* The path refers to the top level directory.  Allocate the level0
        * dirent structure.
        */
 
+#ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
+      num = g_npidhash;
+#endif
+
       level0 = (FAR struct procfs_level0_s *)
-         kmm_zalloc(sizeof(struct procfs_level0_s));
+         kmm_zalloc(sizeof(struct procfs_level0_s) + sizeof(pid_t) * num) ;
       if (!level0)
         {
           ferr("ERROR: Failed to allocate the level0 directory structure\n");
@@ -653,7 +660,11 @@ static int procfs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
        */
 
 #ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
+      level0->base.index = 0;
+      level0->base.nentries = num;
       nxsched_foreach(procfs_enum, level0);
+      level0->base.nentries = level0->base.index;
+      level0->base.index = 0;
       procfs_sort_pid(level0);
 #else
       level0->base.index = 0;