diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index e0e5a1e..f3a9780 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3698,6 +3698,20 @@ include_dir 'conf.d'
        </para>
       </listitem>
      </varlistentry>
+       
+     <varlistentry id="guc-min-parallel-relation-size" xreflabel="min_parallel_relation_size">
+      <term><varname>min_parallel_relation_size</varname> (<type>integer</type>)
+      <indexterm>
+       <primary><varname>min_parallel_relation_size</> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Sets the minimum size of the relation that can be considered for
+        parallel scan.  The default is 8 megabytes (<literal>8MB</>).
+       </para>
+      </listitem>
+     </varlistentry>
 
      <varlistentry id="guc-effective-cache-size" xreflabel="effective_cache_size">
       <term><varname>effective_cache_size</varname> (<type>integer</type>)
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index cc8ba61..fd58efe 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -57,6 +57,8 @@ typedef struct pushdown_safety_info
 bool		enable_geqo = false;	/* just in case GUC doesn't set it */
 int			geqo_threshold;
 
+int			min_parallel_relation_size = DEFAULT_MIN_PARALLEL_RELATION_SIZE;
+
 /* Hook for plugins to get control in set_rel_pathlist() */
 set_rel_pathlist_hook_type set_rel_pathlist_hook = NULL;
 
@@ -690,7 +692,7 @@ create_plain_partial_paths(PlannerInfo *root, RelOptInfo *rel)
 		parallel_workers = rel->rel_parallel_workers;
 	else
 	{
-		int			parallel_threshold = 1000;
+		int			parallel_threshold = min_parallel_relation_size;
 
 		/*
 		 * If this relation is too small to be worth a parallel scan, just
@@ -713,7 +715,7 @@ create_plain_partial_paths(PlannerInfo *root, RelOptInfo *rel)
 		{
 			parallel_workers++;
 			parallel_threshold *= 3;
-			if (parallel_threshold >= PG_INT32_MAX / 3)
+			if (parallel_threshold >= INT_MAX / 3)
 				break;			/* avoid overflow */
 		}
 	}
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 9b02111..34b4b02 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -2735,6 +2735,17 @@ static struct config_int ConfigureNamesInt[] =
 	},
 
 	{
+		{"min_parallel_relation_size", PGC_USERSET, QUERY_TUNING_COST,
+			gettext_noop("Sets the minimum size of the relation that can be considered for parallel scan."),
+			NULL,
+			GUC_UNIT_BLOCKS,
+		},
+		&min_parallel_relation_size,
+		DEFAULT_MIN_PARALLEL_RELATION_SIZE, 1, INT_MAX / 3,
+		NULL, NULL, NULL
+	},
+
+	{
 		{"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
 			gettext_noop("Sets the planner's assumption about the size of the disk cache."),
 			gettext_noop("That is, the portion of the kernel's disk cache that "
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 8260e37..3fa0540 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -304,6 +304,7 @@
 #cpu_operator_cost = 0.0025		# same scale as above
 #parallel_tuple_cost = 0.1		# same scale as above
 #parallel_setup_cost = 1000.0	# same scale as above
+#min_parallel_relation_size = 8MB
 #effective_cache_size = 4GB
 
 # - Genetic Query Optimizer -
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h
index f3b25e2..4b3bdca 100644
--- a/src/include/optimizer/paths.h
+++ b/src/include/optimizer/paths.h
@@ -20,8 +20,11 @@
 /*
  * allpaths.c
  */
+#define DEFAULT_MIN_PARALLEL_RELATION_SIZE	1024		/* measured in pages */
+
 extern bool enable_geqo;
 extern int	geqo_threshold;
+extern int	min_parallel_relation_size;
 
 /* Hook for plugins to get control in set_rel_pathlist() */
 typedef void (*set_rel_pathlist_hook_type) (PlannerInfo *root,