diff --git a/Source/Core/Core/DSP/DSPHWInterface.cpp b/Source/Core/Core/DSP/DSPHWInterface.cpp
index c965233a8e..0e773b8b4b 100644
--- a/Source/Core/Core/DSP/DSPHWInterface.cpp
+++ b/Source/Core/Core/DSP/DSPHWInterface.cpp
@@ -98,7 +98,7 @@ u16 gdsp_mbox_read_l(Mailbox mbx)
   return (u16)value;
 }
 
-void gdsp_ifx_write(u32 addr, u32 val)
+void gdsp_ifx_write(u32 addr, u16 val)
 {
   g_dsp_cap->LogIFXWrite(addr, val);
 
diff --git a/Source/Core/Core/DSP/DSPHWInterface.h b/Source/Core/Core/DSP/DSPHWInterface.h
index 329851fb9a..8c68e1c834 100644
--- a/Source/Core/Core/DSP/DSPHWInterface.h
+++ b/Source/Core/Core/DSP/DSPHWInterface.h
@@ -22,6 +22,6 @@ u16 gdsp_mbox_read_h(Mailbox mbx);
 u16 gdsp_mbox_read_l(Mailbox mbx);
 
 void gdsp_ifx_init();
-void gdsp_ifx_write(u32 addr, u32 val);
+void gdsp_ifx_write(u32 addr, u16 val);
 u16 gdsp_ifx_read(u16 addr);
 }  // namespace DSP
diff --git a/Source/Core/Core/DSP/Jit/DSPJitUtil.cpp b/Source/Core/Core/DSP/Jit/DSPJitUtil.cpp
index 842362c1fb..476637badb 100644
--- a/Source/Core/Core/DSP/Jit/DSPJitUtil.cpp
+++ b/Source/Core/Core/DSP/Jit/DSPJitUtil.cpp
@@ -530,9 +530,9 @@ void DSPEmitter::dmem_write(X64Reg value)
   FixupBranch end = J(true);
   //	else if (saddr == 0xf)
   SetJumpTarget(ifx);
-  // Does it mean gdsp_ifx_write needs u32 rather than u16?
   DSPJitRegCache c(m_gpr);
   X64Reg abisafereg = m_gpr.MakeABICallSafe(value);
+  MOVZX(32, 16, abisafereg, R(abisafereg));
   m_gpr.PushRegs();
   ABI_CallFunctionRR(gdsp_ifx_write, EAX, abisafereg);
   m_gpr.PopRegs();