diff --git a/libc/arch-arm/bionic/memcpy.S b/libc/arch-arm/bionic/memcpy.S
index f5cc67b06..254e8700e 100644
--- a/libc/arch-arm/bionic/memcpy.S
+++ b/libc/arch-arm/bionic/memcpy.S
@@ -28,7 +28,21 @@
 
 #include <machine/cpu-features.h>
 
-#if __ARM_ARCH__ == 7 || defined(__ARM_NEON__)
+/* VERY IMPORTANT NOTE:
+ *        The following ARMv7-optimized version of memcpy is DISABLED !
+ *
+ *        Because the corresponding machine code is not properly emulated
+ *        by the Android emulator at this time, and because running the
+ *        dex pre-optimization pass in the emulator is required when
+ *        building -user images (corresponding to the system images of
+ *        production devices).
+ *
+ *        The code will be re-enabled as soon as we fix the ARMv7 emulation
+ *        issues. An even better fix would be to *not* have to run the
+ *        dex pre-opt pass in the emulator, but on the build host instead.
+ */
+#if 0
+/* #if __ARM_ARCH__ == 7 || defined(__ARM_NEON__) */
 
         .text
         .fpu    neon