diff --git a/pcsx2/CDVD/CDVD.cpp b/pcsx2/CDVD/CDVD.cpp
index f627bfc0c7..90490e575e 100644
--- a/pcsx2/CDVD/CDVD.cpp
+++ b/pcsx2/CDVD/CDVD.cpp
@@ -35,7 +35,7 @@
 
 cdvdStruct cdvd;
 
-s64 PSXCLK = 36864000;
+u32 PSXCLK = 36864000;
 
 static constexpr s32 GMT9_OFFSET_SECONDS = 9 * 60 * 60; // 32400
 
diff --git a/pcsx2/Common.h b/pcsx2/Common.h
index 244b534852..fd7d7752af 100644
--- a/pcsx2/Common.h
+++ b/pcsx2/Common.h
@@ -7,7 +7,7 @@
 
 static const u32 BIAS = 2;				// Bus is half of the actual ps2 speed
 static const u32 PS2CLK = 294912000;	//hz	/* 294.912 mhz */
-extern s64 PSXCLK;	/* 36.864 Mhz */
+extern u32 PSXCLK;	/* 36.864 Mhz */
 
 
 #include "Memory.h"
@@ -21,4 +21,4 @@ extern s64 PSXCLK;	/* 36.864 Mhz */
 #include <string>
 
 extern std::string ShiftJIS_ConvertString( const char* src );
-extern std::string ShiftJIS_ConvertString( const char* src, int maxlen );
\ No newline at end of file
+extern std::string ShiftJIS_ConvertString( const char* src, int maxlen );