diff --git a/include/rng.h b/include/rng.h
new file mode 100644
index 000000000..ea600ea41
--- /dev/null
+++ b/include/rng.h
@@ -0,0 +1,9 @@
+#ifndef GUARD_RNG_H
+#define GUARD_RNG_H
+
+extern u32 gRngValue;
+
+u16 Random(void);
+void SeedRng(u16 seed);
+
+#endif // GUARD_RNG_H
diff --git a/src/link.c b/src/link.c
index 173ddaed3..a5d848b83 100644
--- a/src/link.c
+++ b/src/link.c
@@ -6,6 +6,7 @@
 #include "songs.h"
 #include "link.h"
 #include "palette.h"
+#include "rng.h"
 
 #define SIO_MULTI_CNT ((struct SioMultiCnt *)REG_ADDR_SIOCNT)
 
@@ -27,8 +28,6 @@ struct LinkTestBGInfo
 };
 
 extern void sub_8071C4C(const struct WindowConfig *);
-extern u16 Random(void);
-extern void SeedRng(u16);
 extern void sub_80516C4(u8, u16);
 
 extern u8 unk_2000000[];
diff --git a/src/main.c b/src/main.c
index 4d28ea2d2..751a2c7f8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,6 +5,7 @@
 #include "main.h"
 #include "rtc.h"
 #include "link.h"
+#include "rng.h"
 
 extern struct SoundInfo gSoundInfo;
 extern u32 gUnknown_3004820;
@@ -56,8 +57,6 @@ COMM_2(u8 gPcmDmaCounter)
 EWRAM_DATA void (*gFlashTimerIntrFunc)(void) = NULL;
 
 extern void sub_800C35C(void);
-extern u16 Random(void);
-extern void SeedRng(u16);
 extern void remove_some_task(void);
 extern void c2_copyright_1();
 extern u32 sub_80558AC(void);
diff --git a/src/rng.c b/src/rng.c
index e0a3e6bfb..959a2db9f 100644
--- a/src/rng.c
+++ b/src/rng.c
@@ -1,6 +1,5 @@
 #include "global.h"
-
-extern u32 gRngValue;
+#include "rng.h"
 
 u16 Random(void)
 {