diff --git a/lib/libzstd/Makefile.am b/lib/libzstd/Makefile.am
index 7e92ffb689..7c7035c411 100644
--- a/lib/libzstd/Makefile.am
+++ b/lib/libzstd/Makefile.am
@@ -2,8 +2,9 @@ include $(top_srcdir)/config/Rules.am
 
 VPATH = $(top_srcdir)/module/zstd
 
-# Includes kernel code, generate warnings for large stack frames
-AM_CFLAGS += $(FRAME_LARGER_THAN)
+# -fno-tree-vectorize is set for gcc in zstd/common/compiler.h
+# Set it for other compilers, too.
+AM_CFLAGS += -fno-tree-vectorize
 
 noinst_LTLIBRARIES = libzstd.la
 
@@ -12,12 +13,3 @@ KERNEL_C = \
 	zfs_zstd.c
 
 nodist_libzstd_la_SOURCES = $(KERNEL_C)
-
-# -fno-tree-vectorize is set for gcc in zstd/common/compiler.h
-# Set it for other compilers, too.
-lib/zstd.$(OBJEXT):  CFLAGS += -fno-tree-vectorize
-lib/zstd.l$(OBJEXT): CFLAGS += -fno-tree-vectorize
-
-# Quiet warnings about frame size due to unused code in unmodified zstd lib
-lib/zstd.$(OBJEXT):  CFLAGS += -Wframe-larger-than=20480
-lib/zstd.l$(OBJEXT): CFLAGS += -Wframe-larger-than=20480