diff --git a/Include/Python.h b/Include/Python.h
index 9724fb7..d1ffc73 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -61,6 +61,15 @@
 
 #include "pyport.h"
 
+/* Debug-mode build with pymalloc implies PYMALLOC_DEBUG.
+ *  PYMALLOC_DEBUG is in error if pymalloc is not in use.
+ */
+#if defined(Py_DEBUG) && defined(WITH_PYMALLOC) && !defined(PYMALLOC_DEBUG)
+#define PYMALLOC_DEBUG
+#endif
+#if defined(PYMALLOC_DEBUG) && !defined(WITH_PYMALLOC)
+#error "PYMALLOC_DEBUG requires WITH_PYMALLOC"
+#endif
 #include "pymem.h"
 
 #include "object.h"
diff --git a/Include/pymem.h b/Include/pymem.h
index 10e915f..a321f5b 100644
--- a/Include/pymem.h
+++ b/Include/pymem.h
@@ -89,20 +89,34 @@
    it is recommended to write the test explicitly in the code.
    Note that according to ANSI C, free(NULL) has no effect. */
 
-	
+
 /* pymalloc (private to the interpreter) */
 #ifdef WITH_PYMALLOC
 DL_IMPORT(void *) _PyMalloc_Malloc(size_t nbytes);
 DL_IMPORT(void *) _PyMalloc_Realloc(void *p, size_t nbytes);
 DL_IMPORT(void) _PyMalloc_Free(void *p);
+
+#ifdef PYMALLOC_DEBUG
+DL_IMPORT(void *) _PyMalloc_DebugMalloc(size_t nbytes, int family);
+DL_IMPORT(void *) _PyMalloc_DebugRealloc(void *p, size_t nbytes, int family);
+DL_IMPORT(void) _PyMalloc_DebugFree(void *p, int family);
+DL_IMPORT(void) _PyMalloc_DebugDumpAddress(const void *p);
+DL_IMPORT(void) _PyMalloc_DebugCheckAddress(const void *p);
+#define _PyMalloc_MALLOC(N) _PyMalloc_DebugMalloc(N, 0)
+#define _PyMalloc_REALLOC(P, N) _PyMalloc_DebugRealloc(P, N, 0)
+#define _PyMalloc_FREE(P) _PyMalloc_DebugFree(P, 0)
+
+#else	/* WITH_PYMALLOC && ! PYMALLOC_DEBUG */
 #define _PyMalloc_MALLOC _PyMalloc_Malloc
 #define _PyMalloc_REALLOC _PyMalloc_Realloc
 #define _PyMalloc_FREE _PyMalloc_Free
-#else
+#endif
+
+#else	/* ! WITH_PYMALLOC */
 #define _PyMalloc_MALLOC PyMem_MALLOC
 #define _PyMalloc_REALLOC PyMem_REALLOC
 #define _PyMalloc_FREE PyMem_FREE
-#endif
+#endif	/* WITH_PYMALLOC */
 
 
 #ifdef __cplusplus