diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index c3741fda8a..e1aed48ff7 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -2092,13 +2092,8 @@ dbx_end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
 
   pst->number_of_dependencies = number_dependencies;
   if (number_dependencies)
-    {
-      pst->dependencies = XOBNEWVEC (&objfile->objfile_obstack,
-				     struct partial_symtab *,
-				     number_dependencies);
-      memcpy (pst->dependencies, dependency_list,
-	      number_dependencies * sizeof (struct partial_symtab *));
-    }
+    pst->dependencies
+      = objfile->partial_symtabs->allocate_dependencies (number_dependencies);
   else
     pst->dependencies = 0;
 
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 034d5f477f..eca3c62493 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -6512,8 +6512,7 @@ dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
       subpst->dirname = pst->dirname;
     }
 
-  subpst->dependencies
-    = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
+  subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1);
   subpst->dependencies[0] = pst;
   subpst->number_of_dependencies = 1;
 
@@ -7989,8 +7988,8 @@ process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
       /* Fill in 'dependencies' here; we fill in 'users' in a
 	 post-pass.  */
       pst->number_of_dependencies = len;
-      pst->dependencies =
-	XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
+      pst->dependencies
+	= objfile->partial_symtabs->allocate_dependencies (len);
       for (i = 0;
 	   VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
 			i, iter);
@@ -8248,8 +8247,7 @@ build_type_psymtab_dependencies (void **slot, void *info)
   gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
 
   pst->number_of_dependencies = len;
-  pst->dependencies =
-    XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
+  pst->dependencies = objfile->partial_symtabs->allocate_dependencies (len);
   for (i = 0;
        VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
        ++i)
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 4e07d37f54..8a788b7c69 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -3752,10 +3752,7 @@ parse_partial_symbols (minimal_symbol_reader &reader,
          source files or a reverse .h -> .c dependency for header files.  */
       pst->number_of_dependencies = 0;
       pst->dependencies =
-	((struct partial_symtab **)
-	 obstack_alloc (&objfile->objfile_obstack,
-			((fh->crfd - 1)
-			 * sizeof (struct partial_symtab *))));
+	objfile->partial_symtabs->allocate_dependencies (fh->crfd - 1);
       for (s_idx = 1; s_idx < fh->crfd; s_idx++)
 	{
 	  RFDT rh;
diff --git a/gdb/psymtab.h b/gdb/psymtab.h
index 36dba3245c..8aacc30e38 100644
--- a/gdb/psymtab.h
+++ b/gdb/psymtab.h
@@ -20,6 +20,7 @@
 #ifndef PSYMTAB_H
 #define PSYMTAB_H
 
+#include "gdb_obstack.h"
 #include "symfile.h"
 
 /* A bcache for partial symbols.  */
@@ -60,6 +61,11 @@ public:
     return m_obstack;
   }
 
+  struct partial_symtab **allocate_dependencies (int number)
+  {
+    return OBSTACK_CALLOC (obstack (), number, struct partial_symtab *);
+  }
+
 
   /* Each objfile points to a linked list of partial symtabs derived from
      this file, one partial symtab structure for each compilation unit
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 218cfaef5e..3f2138caa3 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -2079,13 +2079,8 @@ xcoff_end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
 
   pst->number_of_dependencies = number_dependencies;
   if (number_dependencies)
-    {
-      pst->dependencies = XOBNEWVEC (&objfile->objfile_obstack,
-				     struct partial_symtab *,
-				     number_dependencies);
-      memcpy (pst->dependencies, dependency_list,
-	      number_dependencies * sizeof (struct partial_symtab *));
-    }
+    pst->dependencies
+      = objfile->partial_symtabs->allocate_dependencies (number_dependencies);
   else
     pst->dependencies = 0;
 
@@ -2102,7 +2097,7 @@ xcoff_end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
       /* We could save slight bits of space by only making one of these,
          shared by the entire set of include files.  FIXME-someday.  */
       subpst->dependencies =
-	  XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
+	objfile->partial_symtabs->allocate_dependencies (1);
       subpst->dependencies[0] = pst;
       subpst->number_of_dependencies = 1;
 
