diff --git a/include/functions.h b/include/functions.h
index 0970b330c5..56be51a78f 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -478,7 +478,7 @@ float __ull_to_f(unsigned long long l);
 // void osVoiceControlGain(void);
 // void osVoiceStartReadData(void);
 void* osViGetCurrentFramebuffer(void);
-s32 __osSpSetPc(void* data);
+s32 __osSpSetPc(void* pc);
 // void __osVoiceContWrite4(void);
 void __osGetHWIntrRoutine(s32 idx, OSMesgQueue** outQueue, OSMesg* outMsg);
 void __osSetHWIntrRoutine(s32 idx, OSMesgQueue* queue, OSMesg msg);
diff --git a/src/libultra/io/spsetpc.c b/src/libultra/io/spsetpc.c
index d87302bc22..2c3cc32ba0 100644
--- a/src/libultra/io/spsetpc.c
+++ b/src/libultra/io/spsetpc.c
@@ -1,3 +1,13 @@
 #include "global.h"
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/spsetpc/__osSpSetPc.s")
+s32 __osSpSetPc(void* pc) {
+    register u32 spStatus = HW_REG(SP_STATUS_REG, u32);
+
+    if (!(spStatus & SP_STATUS_HALT)) {
+        return -1;
+    } else {
+        HW_REG(SP_PC_REG, void*) = pc;
+    }
+
+    return 0;
+}