diff --git a/src/Makefile b/src/Makefile
index bc7dc5c8..f183e4e3 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -35,7 +35,7 @@ endif
 BINDIR = $(PREFIX)/bin
 
 ### Built-in benchmark for pgo-builds
-PGOBENCH = ./$(EXE) bench 32 1 1 default time
+PGOBENCH = ./$(EXE) bench 16 1 1 default time
 
 ### Object files
 OBJS = benchmark.o bitbase.o bitboard.o endgame.o evaluate.o main.o \