diff --git a/src/cmake/perlasm.cmake b/src/cmake/perlasm.cmake
index 0dc104ca9..17a47b9e0 100644
--- a/src/cmake/perlasm.cmake
+++ b/src/cmake/perlasm.cmake
@@ -40,9 +40,9 @@ function(perlasm var arch dest src)
     add_perlasm_target("${dest}-linux.S" ${src} linux32 ${ARGN})
     append_to_parent_scope("${var}_ASM" "${dest}-linux.S")
   elseif(arch STREQUAL "x86")
-    add_perlasm_target("${dest}-apple.S" ${src} macosx -fPIC -DOPENSSL_IA32_SSE2 ${ARGN})
-    add_perlasm_target("${dest}-linux.S" ${src} elf -fPIC -DOPENSSL_IA32_SSE2 ${ARGN})
-    add_perlasm_target("${dest}-win.asm" ${src} win32n -DOPENSSL_IA32_SSE2 ${ARGN})
+    add_perlasm_target("${dest}-apple.S" ${src} macosx -fPIC ${ARGN})
+    add_perlasm_target("${dest}-linux.S" ${src} elf -fPIC ${ARGN})
+    add_perlasm_target("${dest}-win.asm" ${src} win32n ${ARGN})
     append_to_parent_scope("${var}_ASM" "${dest}-apple.S" "${dest}-linux.S")
     append_to_parent_scope("${var}_NASM" "${dest}-win.asm")
   elseif(arch STREQUAL "x86_64")
diff --git a/src/crypto/chacha/asm/chacha-x86.pl b/src/crypto/chacha/asm/chacha-x86.pl
index 482d53f3d..ec23a51b7 100755
--- a/src/crypto/chacha/asm/chacha-x86.pl
+++ b/src/crypto/chacha/asm/chacha-x86.pl
@@ -45,7 +45,7 @@ require "x86asm.pl";
 $output=pop;
 open STDOUT,">$output";
 
-&asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
 $xmm=$ymm=1;
 $gasver=999;  # enable everything
diff --git a/src/crypto/fipsmodule/aes/asm/vpaes-x86.pl b/src/crypto/fipsmodule/aes/asm/vpaes-x86.pl
index 04c407d75..d7c090563 100644
--- a/src/crypto/fipsmodule/aes/asm/vpaes-x86.pl
+++ b/src/crypto/fipsmodule/aes/asm/vpaes-x86.pl
@@ -62,7 +62,7 @@ $output = pop;
 open OUT,">$output";
 *STDOUT=*OUT;
 
-&asm_init($ARGV[0],$x86only = $ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
 $PREFIX="vpaes";
 
diff --git a/src/crypto/fipsmodule/bn/asm/bn-586.pl b/src/crypto/fipsmodule/bn/asm/bn-586.pl
index c23d6a929..eae6da946 100644
--- a/src/crypto/fipsmodule/bn/asm/bn-586.pl
+++ b/src/crypto/fipsmodule/bn/asm/bn-586.pl
@@ -16,8 +16,7 @@ open STDOUT,">$output";
 
 &asm_init($ARGV[0]);
 
-$sse2=0;
-for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
+$sse2=1;
 
 &external_label("OPENSSL_ia32cap_P") if ($sse2);
 
diff --git a/src/crypto/fipsmodule/bn/asm/x86-mont.pl b/src/crypto/fipsmodule/bn/asm/x86-mont.pl
index 58b28ade8..c097574a8 100755
--- a/src/crypto/fipsmodule/bn/asm/x86-mont.pl
+++ b/src/crypto/fipsmodule/bn/asm/x86-mont.pl
@@ -42,8 +42,7 @@ open STDOUT,">$output";
 
 &asm_init($ARGV[0]);
 
-$sse2=0;
-for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
+$sse2=1;
 
 &external_label("OPENSSL_ia32cap_P") if ($sse2);
 
diff --git a/src/crypto/fipsmodule/modes/asm/ghash-x86.pl b/src/crypto/fipsmodule/modes/asm/ghash-x86.pl
index f893b50c2..17dbeadb8 100644
--- a/src/crypto/fipsmodule/modes/asm/ghash-x86.pl
+++ b/src/crypto/fipsmodule/modes/asm/ghash-x86.pl
@@ -141,10 +141,10 @@ require "x86asm.pl";
 $output=pop;
 open STDOUT,">$output";
 
-&asm_init($ARGV[0],$x86only = $ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
-$sse2=0;
-for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
+$x86only=0;
+$sse2=1;
 
 if (!$x86only) {{{
 if ($sse2) {{
diff --git a/src/crypto/fipsmodule/sha/asm/sha1-586.pl b/src/crypto/fipsmodule/sha/asm/sha1-586.pl
index 90c236108..795263652 100644
--- a/src/crypto/fipsmodule/sha/asm/sha1-586.pl
+++ b/src/crypto/fipsmodule/sha/asm/sha1-586.pl
@@ -126,18 +126,15 @@ require "x86asm.pl";
 $output=pop;
 open STDOUT,">$output";
 
-&asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
-$xmm=$ymm=0;
-for (@ARGV) { $xmm=1 if (/-DOPENSSL_IA32_SSE2/); }
+$xmm = 1;
 
 # In upstream, this is controlled by shelling out to the compiler to check
 # versions, but BoringSSL is intended to be used with pre-generated perlasm
 # output, so this isn't useful anyway.
 $ymm = 1;
 
-$ymm = 0 unless ($xmm);
-
 $shaext=$xmm;	### set to zero if compiling for 1.0.1
 
 # TODO(davidben): Consider enabling the Intel SHA Extensions code once it's
diff --git a/src/crypto/fipsmodule/sha/asm/sha256-586.pl b/src/crypto/fipsmodule/sha/asm/sha256-586.pl
index 99b4cf195..d23d81fbf 100644
--- a/src/crypto/fipsmodule/sha/asm/sha256-586.pl
+++ b/src/crypto/fipsmodule/sha/asm/sha256-586.pl
@@ -76,10 +76,9 @@ require "x86asm.pl";
 $output=pop;
 open STDOUT,">$output";
 
-&asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
-$xmm=$avx=0;
-for (@ARGV) { $xmm=1 if (/-DOPENSSL_IA32_SSE2/); }
+$xmm = 1;
 
 # In upstream, this is controlled by shelling out to the compiler to check
 # versions, but BoringSSL is intended to be used with pre-generated perlasm
diff --git a/src/crypto/fipsmodule/sha/asm/sha512-586.pl b/src/crypto/fipsmodule/sha/asm/sha512-586.pl
index 1aee14d18..b28877658 100644
--- a/src/crypto/fipsmodule/sha/asm/sha512-586.pl
+++ b/src/crypto/fipsmodule/sha/asm/sha512-586.pl
@@ -62,10 +62,9 @@ require "x86asm.pl";
 $output=pop;
 open STDOUT,">$output";
 
-&asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
+&asm_init($ARGV[0]);
 
-$sse2=0;
-for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
+$sse2=1;
 
 &external_label("OPENSSL_ia32cap_P") if ($sse2);
 
diff --git a/src/util/generate_build_files.py b/src/util/generate_build_files.py
index e29a20314..6038ba24d 100644
--- a/src/util/generate_build_files.py
+++ b/src/util/generate_build_files.py
@@ -30,13 +30,13 @@ import json
 # downstream scripts import this to find what folders to add/remove from git.
 OS_ARCH_COMBOS = [
     ('apple', 'aarch64', 'ios64', [], 'S'),
-    ('apple', 'x86', 'macosx', ['-fPIC', '-DOPENSSL_IA32_SSE2'], 'S'),
+    ('apple', 'x86', 'macosx', ['-fPIC'], 'S'),
     ('apple', 'x86_64', 'macosx', [], 'S'),
     ('linux', 'arm', 'linux32', [], 'S'),
     ('linux', 'aarch64', 'linux64', [], 'S'),
-    ('linux', 'x86', 'elf', ['-fPIC', '-DOPENSSL_IA32_SSE2'], 'S'),
+    ('linux', 'x86', 'elf', ['-fPIC'], 'S'),
     ('linux', 'x86_64', 'elf', [], 'S'),
-    ('win', 'x86', 'win32n', ['-DOPENSSL_IA32_SSE2'], 'asm'),
+    ('win', 'x86', 'win32n', [], 'asm'),
     ('win', 'x86_64', 'nasm', [], 'asm'),
     ('win', 'aarch64', 'win64', [], 'S'),
 ]