diff --git a/firmware/target/mips/ingenic_jz47xx/onda_vx747/lcd-onda_vx747.c b/firmware/target/mips/ingenic_jz47xx/onda_vx747/lcd-onda_vx747.c
index a2240e0f7d..f9ce62f7da 100644
--- a/firmware/target/mips/ingenic_jz47xx/onda_vx747/lcd-onda_vx747.c
+++ b/firmware/target/mips/ingenic_jz47xx/onda_vx747/lcd-onda_vx747.c
@@ -37,7 +37,7 @@ do {                                    \
 } while (0)
 
 
-#define SLEEP(x) { register int __i; for(__i=0; __i<x; __i++) {asm("nop"); asm("nop");} }
+#define SLEEP(x) { register int __i; for(__i=0; __i<x; __i++) asm volatile("nop\n nop\n"); }
 #define DELAY    SLEEP(700000);
 static void _display_pin_init(void)
 {
diff --git a/firmware/target/mips/ingenic_jz47xx/onda_vx767/lcd-onda_vx767.c b/firmware/target/mips/ingenic_jz47xx/onda_vx767/lcd-onda_vx767.c
index a91e041184..b3cc6980e1 100644
--- a/firmware/target/mips/ingenic_jz47xx/onda_vx767/lcd-onda_vx767.c
+++ b/firmware/target/mips/ingenic_jz47xx/onda_vx767/lcd-onda_vx767.c
@@ -37,7 +37,7 @@ do {                                       \
 } while (0)
 
 
-#define SLEEP(x) for(i=0; i<x; i++) asm("nop"); asm("nop");
+#define SLEEP(x) for(i=0; i<x; i++) asm volatile("nop\n nop\n");
 #define DELAY    SLEEP(700000);
 static void _display_pin_init(void)
 {