diff --git a/pcsx2/SPU2/Mixer.cpp b/pcsx2/SPU2/Mixer.cpp
index 72b4b31c7c437..b0dbd70b0d95b 100644
--- a/pcsx2/SPU2/Mixer.cpp
+++ b/pcsx2/SPU2/Mixer.cpp
@@ -28,16 +28,6 @@ static const s32 tbl_XA_Factor[16][2] =
 		{98, -55},
 		{122, -60}};
 
-__forceinline s32 clamp_mix(s32 x)
-{
-	return std::clamp(x, -0x8000, 0x7fff);
-}
-
-__forceinline StereoOut32 clamp_mix(StereoOut32 sample)
-{
-	return StereoOut32(clamp_mix(sample.Left), clamp_mix(sample.Right));
-}
-
 static void __forceinline XA_decode_block(s16* buffer, const s16* block, s32& prev1, s32& prev2)
 {
 	const s32 header = *block;
diff --git a/pcsx2/SPU2/Mixer.h b/pcsx2/SPU2/Mixer.h
index 6e40f640bf2b9..11a4544e92def 100644
--- a/pcsx2/SPU2/Mixer.h
+++ b/pcsx2/SPU2/Mixer.h
@@ -16,5 +16,3 @@
 #pragma once
 
 extern void Mix();
-extern s32 clamp_mix(s32 x);
-extern StereoOut32 clamp_mix(StereoOut32 sample);
diff --git a/pcsx2/SPU2/defs.h b/pcsx2/SPU2/defs.h
index b2c29e0d3f5f0..2d08792db2b97 100644
--- a/pcsx2/SPU2/defs.h
+++ b/pcsx2/SPU2/defs.h
@@ -40,11 +40,21 @@ extern s16 spu2M_Read(u32 addr);
 extern void spu2M_Write(u32 addr, s16 value);
 extern void spu2M_Write(u32 addr, u16 value);
 
-static inline s16 SignExtend16(u16 v)
+static __forceinline s16 SignExtend16(u16 v)
 {
 	return (s16)v;
 }
 
+static __forceinline s32 clamp_mix(s32 x)
+{
+	return std::clamp(x, -0x8000, 0x7fff);
+}
+
+static __forceinline StereoOut32 clamp_mix(StereoOut32 sample)
+{
+	return StereoOut32(clamp_mix(sample.Left), clamp_mix(sample.Right));
+}
+
 struct V_VolumeLR
 {
 	static V_VolumeLR Max;