diff --git a/src/rsrt0.S b/src/rsrt0.S
index e3bb3ec..3f06450 100644
--- a/src/rsrt0.S
+++ b/src/rsrt0.S
@@ -23,6 +23,13 @@ __start:
     msr CPSR_c, r0
     ldr sp, =0x03007F00
 
+    @ Sets WAITCNT to the default used by GBA games
+    @
+    @ See https://problemkaputt.de/gbatek.htm#gbasystemcontrol for reference.
+    ldr r0, =0x04000204
+    ldr r1, =0x4317
+    str r1, [r0]
+
     @ copy .data and .text_iwram section to IWRAM
     ldr r0, =__iwram_lma     @ source address
     ldr r1, =__iwram_start   @ destination address