diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/source/transform_neon.S b/webrtc/modules/audio_coding/codecs/isac/fix/source/transform_neon.S
index 6713b28..98ce389 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/source/transform_neon.S
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/source/transform_neon.S
@@ -27,7 +27,8 @@
 
 DEFINE_FUNCTION WebRtcIsacfix_Time2SpecNeon
 .align  2
-  push {r4-r11,lr}
+  push {r3-r11,lr}            @ need to push r4-r11, but push r3 too to keep
+                              @ stack 8-byte aligned
   sub sp, sp, #(16 + FRAMESAMPLES * 4)
 
   str r0, [sp]                @ inre1Q9
@@ -227,7 +228,7 @@
   bgt Time2Spec_PostFftTransform
 
   add sp, sp, #(16 + FRAMESAMPLES * 4)
-  pop {r4-r11,pc}
+  pop {r3-r11,pc}
 
 .align  8
 @ Cosine table 1 in Q14
@@ -328,7 +329,8 @@
 
 DEFINE_FUNCTION WebRtcIsacfix_Spec2TimeNeon
 .align  2
-  push {r4-r11,lr}
+  push {r3-r11,lr}            @ need to push r4-r11, but push r3 too to keep
+                              @ stack 8-byte aligned
 
   sub sp, sp, #16
   str r0, [sp]                @ inreQ7
@@ -640,4 +642,4 @@
   bgt DemodulateAndSeparate
 
   add sp, sp, #16
-  pop {r4-r11,pc}
+  pop {r3-r11,pc}