diff --git a/vvp/schedule.cc b/vvp/schedule.cc
index 1928f85a9..73abf2eed 100644
--- a/vvp/schedule.cc
+++ b/vvp/schedule.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2013 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 2001-2015 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -17,6 +17,7 @@
  *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+# include  "config.h"
 # include  "schedule.h"
 # include  "vthread.h"
 # include  "vpi_priv.h"
@@ -27,8 +28,11 @@
 # include  <csignal>
 # include  <cstdlib>
 # include  <cassert>
-
 # include  <iostream>
+#ifdef CHECK_WITH_VALGRIND
+# include  "vvp_cleanup.h"
+# include  "ivl_alloc.h"
+#endif
 
 unsigned long count_assign_events = 0;
 unsigned long count_gen_events = 0;
@@ -1137,4 +1141,21 @@ void schedule_simulate(void)
 
       // Execute post-simulation callbacks
       vpiPostsim();
+#ifdef CHECK_WITH_VALGRIND
+      schedule_delete();
+#endif
 }
+
+#ifdef CHECK_WITH_VALGRIND
+void schedule_delete(void)
+{
+      vthread_event_heap.delete_pool();
+      assign4_heap.delete_pool();
+      assign8_heap.delete_pool();
+      assignr_heap.delete_pool();
+      array_w_heap.delete_pool();
+      array_r_w_heap.delete_pool();
+      generic_event_heap.delete_pool();
+      event_time_heap.delete_pool();
+}
+#endif
diff --git a/vvp/slab.h b/vvp/slab.h
index 1541b6969..e19930702 100644
--- a/vvp/slab.h
+++ b/vvp/slab.h
@@ -1,7 +1,7 @@
 #ifndef IVL_slab_H
 #define IVL_slab_H
 /*
- * Copyright (c) 2008-2014 Picture Elements, Inc.
+ * Copyright (c) 2008-2015 Picture Elements, Inc.
  *    Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
@@ -21,6 +21,8 @@
  */
 
 
+# include  "config.h"
+
 template <size_t SLAB_SIZE, size_t CHUNK_COUNT> class slab_t {
 
       union item_cell_u {
@@ -33,12 +35,22 @@ template <size_t SLAB_SIZE, size_t CHUNK_COUNT> class slab_t {
 
       void* alloc_slab();
       void  free_slab(void*);
+#ifdef CHECK_WITH_VALGRIND
+	// If we have allocated memory then we need to delete it to make
+	// valgrind happy.
+      void delete_pool(void);
+#endif
 
       unsigned long pool;
 
     private:
       item_cell_u*heap_;
       item_cell_u initial_chunk_[CHUNK_COUNT];
+#ifdef CHECK_WITH_VALGRIND
+	// Each slab needs a pointer to the allocated space.
+      item_cell_u**slab_pool;
+      unsigned slab_pool_count;
+#endif
 };
 
 template <size_t SLAB_SIZE, size_t CHUNK_COUNT>
@@ -50,6 +62,11 @@ slab_t<SLAB_SIZE,CHUNK_COUNT>::slab_t()
 	    initial_chunk_[idx].next = initial_chunk_+idx+1;
 
       initial_chunk_[CHUNK_COUNT-1].next = 0;
+#ifdef CHECK_WITH_VALGRIND
+	// Initially we have no allocated space.
+      slab_pool = NULL;
+      slab_pool_count = 0;
+#endif
 }
 
 template <size_t SLAB_SIZE, size_t CHUNK_COUNT>
@@ -57,6 +74,12 @@ inline void* slab_t<SLAB_SIZE,CHUNK_COUNT>::alloc_slab()
 {
       if (heap_ == 0) {
 	    item_cell_u*chunk = new item_cell_u[CHUNK_COUNT];
+#ifdef CHECK_WITH_VALGRIND
+	    slab_pool_count += 1;
+	    slab_pool = (item_cell_u **) realloc(slab_pool,
+	                slab_pool_count*sizeof(item_cell_u **));
+	    slab_pool[slab_pool_count-1] = chunk;
+#endif
 	    for (unsigned idx = 0 ; idx < CHUNK_COUNT ; idx += 1) {
 		  chunk[idx].next = heap_;
 		  heap_ = chunk+idx;
@@ -77,4 +100,18 @@ inline void slab_t<SLAB_SIZE,CHUNK_COUNT>::free_slab(void*ptr)
       heap_ = cur;
 }
 
+#ifdef CHECK_WITH_VALGRIND
+template <size_t SLAB_SIZE, size_t CHUNK_COUNT>
+inline void slab_t<SLAB_SIZE,CHUNK_COUNT>::delete_pool(void)
+{
+      for (unsigned idx = 0; idx < slab_pool_count; idx += 1) {
+	    delete [] slab_pool[idx];
+      }
+      free(slab_pool);
+      slab_pool = NULL;
+      slab_pool_count = 0;
+}
+#endif
+
+
 #endif /* IVL_slab_H */
diff --git a/vvp/vvp_cleanup.h b/vvp/vvp_cleanup.h
index 47cf6c479..99785ca00 100644
--- a/vvp/vvp_cleanup.h
+++ b/vvp/vvp_cleanup.h
@@ -1,7 +1,7 @@
 #ifndef IVL_vvp_cleanup_H
 #define IVL_vvp_cleanup_H
 /*
- * Copyright (c) 2009-2014 Cary R. (cygcary@yahoo.com)
+ * Copyright (c) 2009-2015 Cary R. (cygcary@yahoo.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -33,6 +33,7 @@ extern void vpi_mcd_delete(void);
 extern void load_module_delete(void);
 extern void modpath_delete(void);
 extern void root_table_delete(void);
+extern void schedule_delete(void);
 extern void signal_pool_delete(void);
 extern void simulator_cb_delete(void);
 extern void udp_defns_delete(void);