diff --git a/Makefile.am b/Makefile.am
index 8335c92..3a8e603 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -60,21 +60,25 @@ pkginclude_HEADERS += $(sort ${extern_hdrs})
 libisal_la_SOURCES = ${lsrc}
 
 if CPU_X86_64
+ARCH=-Dx86_64
 libisal_la_SOURCES += ${lsrc_x86_64}
 other_tests += ${other_tests_x86_64}
 endif
 
 if CPU_X86_32
+ARCH=-Dx86_32
 libisal_la_SOURCES += ${lsrc_x86_32}
 other_tests += ${other_tests_x86_32}
 endif
 
 if CPU_AARCH64
+ARCH=-Daarch64
 libisal_la_SOURCES += ${lsrc_aarch64}
 other_tests += ${other_tests_aarch64}
 endif
 
 if CPU_PPC64LE
+ARCH=-Dppc64le
 libisal_la_SOURCES += ${lsrc_ppc64le}
 other_tests += ${other_tests_ppc64le}
 endif
@@ -132,7 +136,7 @@ CCAS = $(as_filter)
 EXTRA_DIST += tools/yasm-filter.sh tools/nasm-filter.sh
 EXTRA_DIST += tools/yasm-cet-filter.sh tools/nasm-cet-filter.sh
 
-AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${D}
+AM_CFLAGS = ${my_CFLAGS} ${INCLUDE} $(src_include) ${ARCH} ${D}
 if CPU_AARCH64
 AM_CCASFLAGS = ${AM_CFLAGS}
 else
diff --git a/make.inc b/make.inc
index 16303bd..993cb9c 100644
--- a/make.inc
+++ b/make.inc
@@ -122,7 +122,7 @@ endif
 
 D :=
 INCLUDE   = $(patsubst %,-I%/,$(subst :, ,$(VPATH)))
-CFLAGS   = $(CFLAGS_$(arch)) $(CFLAGS_$(CC)) $(DEBUG) -O2 $(DEFINES) $(INCLUDE)
+CFLAGS   = $(CFLAGS_$(arch)) $(CFLAGS_$(CC)) $(DEBUG) -O2 $(DEFINES) $(INCLUDE) -D$(host_cpu)
 ASFLAGS  = $(ASFLAGS_$(arch)) $(ASFLAGS_$(CC)) $(DEBUG_$(AS)) $(DEFINES) $(INCLUDE)
 ARFLAGS  = $(ARFLAGS_$(arch))
 DEFINES += $(addprefix -D , $D)