diff --git a/internal/c/libqb.cpp b/internal/c/libqb.cpp
index c251dd384..6c8f6be15 100644
--- a/internal/c/libqb.cpp
+++ b/internal/c/libqb.cpp
@@ -13,6 +13,7 @@
 #endif
 
 #include "audio.h"
+#include "cmem.h"
 #include "completion.h"
 #include "command.h"
 #include "compression.h"
@@ -7149,7 +7150,6 @@ extern uint8 *cmem_dynamic_base;
 
 extern uint32 qbs_cmem_sp; //=256;
 extern uint32 cmem_sp;     //=65536;
-extern ptrszint dblock;    // 32bit offset of dblock
 extern uint64 *nothingvalue;
 
 uint8 wait_needed = 1;
diff --git a/internal/c/libqb.h b/internal/c/libqb.h
index e131f0753..552631120 100644
--- a/internal/c/libqb.h
+++ b/internal/c/libqb.h
@@ -2,6 +2,7 @@
 #define INC_LIBQB_H
 #include "common.h"
 
+#include "cmem.h"
 #include "qbs.h"
 
 void sub_shell4(qbs *, int32); //_DONTWAIT & _HIDE
@@ -41,8 +42,6 @@ int32 gfs_write(int32 i, int64 position, uint8 *data, int64 size);
 int32 gfs_read(int32 i, int64 position, uint8 *data, int64 size);
 int64 gfs_read_bytes();
 
-extern uint8 cmem[1114099]; // 16*65535+65535+3 (enough for highest referencable dword in conv memory)
-
 // keyhit cyclic buffer
 extern int64 keyhit[8192];
 //    keyhit specific internal flags: (stored in high 32-bits)
diff --git a/internal/c/libqb/include/cmem.h b/internal/c/libqb/include/cmem.h
new file mode 100644
index 000000000..598d916a0
--- /dev/null
+++ b/internal/c/libqb/include/cmem.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdint.h>
+
+extern uint8_t cmem[1114099]; // 16*65535+65535+3 (enough for highest referencable dword in conv memory)
+extern intptr_t dblock;         // Required for Play(). Did not find this declared anywhere
diff --git a/internal/c/libqb/src/qbs_cmem.cpp b/internal/c/libqb/src/qbs_cmem.cpp
index 429b1187f..5980346ca 100644
--- a/internal/c/libqb/src/qbs_cmem.cpp
+++ b/internal/c/libqb/src/qbs_cmem.cpp
@@ -4,14 +4,13 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "cmem.h"
 #include "error_handle.h"
 #include "qbs.h"
 
 // FIXME: conventional memory should be consolidated into libqb soruce and headers
-extern uintptr_t dblock;
 extern uint32_t qbs_cmem_sp; //=256;
 extern uint32_t cmem_sp;     //=65536;
-extern uint8_t cmem[1114099]; // 16*65535+65535+3 (enough for highest referencable dword in conv memory)
 
 // Used to track strings in 16bit memory
 static intptr_t *qbs_cmem_list = (intptr_t *)malloc(65536 * sizeof(intptr_t));
diff --git a/internal/c/qbx.cpp b/internal/c/qbx.cpp
index 58b993967..b655dd695 100755
--- a/internal/c/qbx.cpp
+++ b/internal/c/qbx.cpp
@@ -564,7 +564,7 @@ uint16 call_absolute_offsets[256];
 uint32 dbgline;
 uint32 qbs_cmem_sp = 256;
 uint32 cmem_sp = 65536;
-ptrszint dblock; // 32bit offset of dblock
+intptr_t dblock; // 32bit offset of dblock
 uint8 close_program = 0;
 int32 tab_spc_cr_size = 1; // 1=PRINT(default), 2=FILE
 int32 tab_fileno = 0;      // only valid if tab_spc_cr_size=2
@@ -576,7 +576,7 @@ qbs *nothingstring;
 uint32 qbevent = 0;
 uint8 suspend_program = 0;
 uint8 stop_program = 0;
-uint8 cmem[1114099]; // 16*65535+65535+3 (enough for highest referencable dword
+uint8_t cmem[1114099]; // 16*65535+65535+3 (enough for highest referencable dword
                      // in conv memory)
 uint8 *cmem_static_pointer = &cmem[0] + 1280 + 65536;
 uint8 *cmem_dynamic_base = &cmem[0] + 655360;