diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index a65acd891049..263b143e3132 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -1616,6 +1616,7 @@ _gin_parallel_merge(GinBuildState *state)
 	Size		tuplen;
 	double		reltuples = 0;
 	GinBuffer  *buffer;
+	MemoryContext oldCtx;
 
 	/* GIN tuples from workers, merged by leader */
 	double		numtuples = 0;
@@ -1689,9 +1690,12 @@ _gin_parallel_merge(GinBuildState *state)
 
 			oldCtx = MemoryContextSwitchTo(state->tmpCtx);
 
+			oldCtx = MemoryContextSwitchTo(state->tmpCtx);
 			ginEntryInsert(&state->ginstate,
 						   buffer->attnum, buffer->key, buffer->category,
 						   buffer->items, buffer->nitems, &state->buildStats);
+			MemoryContextSwitchTo(oldCtx);
+			MemoryContextReset(state->tmpCtx);
 
 			MemoryContextSwitchTo(oldCtx);
 			MemoryContextReset(state->tmpCtx);
@@ -1720,9 +1724,12 @@ _gin_parallel_merge(GinBuildState *state)
 
 			oldCtx = MemoryContextSwitchTo(state->tmpCtx);
 
+			oldCtx = MemoryContextSwitchTo(state->tmpCtx);
 			ginEntryInsert(&state->ginstate,
 						   buffer->attnum, buffer->key, buffer->category,
 						   buffer->items, buffer->nfrozen, &state->buildStats);
+			MemoryContextSwitchTo(oldCtx);
+			MemoryContextReset(state->tmpCtx);
 
 			MemoryContextSwitchTo(oldCtx);
 			MemoryContextReset(state->tmpCtx);