diff --git a/build/cmake/aom_configure.cmake b/build/cmake/aom_configure.cmake
index 96e39d7..4f17b4b 100644
--- a/build/cmake/aom_configure.cmake
+++ b/build/cmake/aom_configure.cmake
@@ -137,7 +137,6 @@
   if (ENABLE_NASM)
     find_program(AS_EXECUTABLE nasm $ENV{NASM_PATH})
     test_nasm()
-    set(AOM_AS_FLAGS ${AOM_AS_FLAGS} -Ox)
   else ()
     find_program(AS_EXECUTABLE yasm $ENV{YASM_PATH})
   endif ()
diff --git a/build/cmake/aom_optimization.cmake b/build/cmake/aom_optimization.cmake
index c58c399..59b47e8 100644
--- a/build/cmake/aom_optimization.cmake
+++ b/build/cmake/aom_optimization.cmake
@@ -200,17 +200,11 @@
 endfunction ()
 
 # Terminates generation if nasm found in PATH does not meet requirements.
-# Currently checks only for presence of required object formats and support for
-# the -Ox argument (multipass optimization).
+# Currently checks only for presence of required object formats.
 function (test_nasm)
   execute_process(COMMAND ${AS_EXECUTABLE} -hf
                   OUTPUT_VARIABLE nasm_helptext)
 
-  if (NOT "${nasm_helptext}" MATCHES "-Ox")
-    message(FATAL_ERROR
-            "Unsupported nasm: multipass optimization not supported.")
-  endif ()
-
   if ("${AOM_TARGET_CPU}" STREQUAL "x86")
     if ("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
       if (NOT "${nasm_helptext}" MATCHES "macho32")
diff --git a/build/make/configure.sh b/build/make/configure.sh
index 8ca2213..44c706f 100644
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -1267,7 +1267,6 @@
         esac
         log_echo "  using $AS"
       fi
-      [ "${AS##*/}" = nasm ] && add_asflags -Ox
       AS_SFX=.asm
       case  ${tgt_os} in
         win32)