diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-04-10-18-12-11.bpo-36594.fbnJAc.rst b/Misc/NEWS.d/next/Core and Builtins/2019-04-10-18-12-11.bpo-36594.fbnJAc.rst
new file mode 100644
index 0000000..7ca5dd9
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2019-04-10-18-12-11.bpo-36594.fbnJAc.rst
@@ -0,0 +1,2 @@
+Fix incorrect use of ``%p`` in format strings.
+Patch by Zackery Spytz.
diff --git a/Modules/_ctypes/_ctypes_test.c b/Modules/_ctypes/_ctypes_test.c
index f842058..bae4976 100644
--- a/Modules/_ctypes/_ctypes_test.c
+++ b/Modules/_ctypes/_ctypes_test.c
@@ -87,7 +87,7 @@
 EXPORT(long double)testfunc_Ddd(double a, double b)
 {
     long double result = (long double)(a * b);
-    printf("testfunc_Ddd(%p, %p)\n", &a, &b);
+    printf("testfunc_Ddd(%p, %p)\n", (void *)&a, (void *)&b);
     printf("testfunc_Ddd(%g, %g)\n", a, b);
     return result;
 }
@@ -95,7 +95,7 @@
 EXPORT(long double)testfunc_DDD(long double a, long double b)
 {
     long double result = a * b;
-    printf("testfunc_DDD(%p, %p)\n", &a, &b);
+    printf("testfunc_DDD(%p, %p)\n", (void *)&a, (void *)&b);
     printf("testfunc_DDD(%Lg, %Lg)\n", a, b);
     return result;
 }
@@ -103,7 +103,7 @@
 EXPORT(int)testfunc_iii(int a, int b)
 {
     int result = a * b;
-    printf("testfunc_iii(%p, %p)\n", &a, &b);
+    printf("testfunc_iii(%p, %p)\n", (void *)&a, (void *)&b);
     return result;
 }
 
@@ -361,7 +361,7 @@
 {
     void *ptr;
 
-    printf("_xxx_init got %p %p\n", Xalloc, Xfree);
+    printf("_xxx_init got %p %p\n", (void *)Xalloc, (void *)Xfree);
     printf("calling\n");
     ptr = Xalloc(32);
     Xfree(ptr);
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 1ad842e..a8ba84b 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -531,11 +531,11 @@
     default:
         if (is_literal_char((unsigned char)self->tag)) {
             sprintf(buffer, "<cparam '%c' at %p>",
-                (unsigned char)self->tag, self);
+                (unsigned char)self->tag, (void *)self);
         }
         else {
             sprintf(buffer, "<cparam 0x%02x at %p>",
-                (unsigned char)self->tag, self);
+                (unsigned char)self->tag, (void *)self);
         }
         break;
     }
diff --git a/Modules/_xxsubinterpretersmodule.c b/Modules/_xxsubinterpretersmodule.c
index 1cf43b7..0d8e5f3 100644
--- a/Modules/_xxsubinterpretersmodule.c
+++ b/Modules/_xxsubinterpretersmodule.c
@@ -1250,7 +1250,7 @@
     // Do the things that would have been done in _channels_close().
     ref->chan = NULL;
     _channel_free(chan);
-};
+}
 
 /* "high"-level channel-related functions */
 
diff --git a/Modules/hashtable.c b/Modules/hashtable.c
index e6f8daf..4a36a1e 100644
--- a/Modules/hashtable.c
+++ b/Modules/hashtable.c
@@ -240,7 +240,7 @@
     }
     printf("hash table %p: entries=%"
            PY_FORMAT_SIZE_T "u/%" PY_FORMAT_SIZE_T "u (%.0f%%), ",
-           ht, ht->entries, ht->num_buckets, load * 100.0);
+           (void *)ht, ht->entries, ht->num_buckets, load * 100.0);
     if (nchains)
         printf("avg_chain_len=%.1f, ", (double)total_chain_len / nchains);
     printf("max_chain_len=%" PY_FORMAT_SIZE_T "u, %" PY_FORMAT_SIZE_T "u KiB\n",
diff --git a/Objects/object.c b/Objects/object.c
index 589bf36..732f9cc 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -385,7 +385,7 @@
                universally available */
             Py_BEGIN_ALLOW_THREADS
             fprintf(fp, "<refcnt %ld at %p>",
-                (long)op->ob_refcnt, op);
+                (long)op->ob_refcnt, (void *)op);
             Py_END_ALLOW_THREADS
         }
         else {
@@ -499,7 +499,7 @@
         "address : %p\n",
         Py_TYPE(op)==NULL ? "NULL" : Py_TYPE(op)->tp_name,
         (long)op->ob_refcnt,
-        op);
+        (void *)op);
     fflush(stderr);
 }
 
@@ -1894,7 +1894,7 @@
     PyObject *op;
     fprintf(fp, "Remaining objects:\n");
     for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
-        fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] ", op, op->ob_refcnt);
+        fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] ", (void *)op, op->ob_refcnt);
         if (PyObject_Print(op, fp, 0) != 0)
             PyErr_Clear();
         putc('\n', fp);
@@ -1910,7 +1910,7 @@
     PyObject *op;
     fprintf(fp, "Remaining object addresses:\n");
     for (op = refchain._ob_next; op != &refchain; op = op->_ob_next)
-        fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] %s\n", op,
+        fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] %s\n", (void *)op,
             op->ob_refcnt, Py_TYPE(op)->tp_name);
 }
 
@@ -2167,7 +2167,7 @@
         fprintf(stderr, "<object: ob_type=NULL>\n");
     }
     else if (_PyObject_IsFreed((PyObject *)Py_TYPE(obj))) {
-        fprintf(stderr, "<object: freed type %p>\n", Py_TYPE(obj));
+        fprintf(stderr, "<object: freed type %p>\n", (void *)Py_TYPE(obj));
     }
     else {
         /* Diplay the traceback where the object has been allocated.
diff --git a/Objects/obmalloc.c b/Objects/obmalloc.c
index 3ee1435..7cfd289 100644
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -2354,7 +2354,7 @@
     }
 
     tail = q + nbytes;
-    fprintf(stderr, "    The %d pad bytes at tail=%p are ", SST, tail);
+    fprintf(stderr, "    The %d pad bytes at tail=%p are ", SST, (void *)tail);
     ok = 1;
     for (i = 0; i < SST; ++i) {
         if (tail[i] != FORBIDDENBYTE) {
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 4d86519e8..eaba583 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1251,7 +1251,7 @@
 }
 void *_PyUnicode_data(void *unicode_raw) {
     PyObject *unicode = _PyObject_CAST(unicode_raw);
-    printf("obj %p\n", unicode);
+    printf("obj %p\n", (void*)unicode);
     printf("compact %d\n", PyUnicode_IS_COMPACT(unicode));
     printf("compact ascii %d\n", PyUnicode_IS_COMPACT_ASCII(unicode));
     printf("ascii op %p\n", ((void*)((PyASCIIObject*)(unicode) + 1)));
@@ -1282,14 +1282,14 @@
 
     if (ascii->wstr == data)
         printf("shared ");
-    printf("wstr=%p", ascii->wstr);
+    printf("wstr=%p", (void *)ascii->wstr);
 
     if (!(ascii->state.ascii == 1 && ascii->state.compact == 1)) {
         printf(" (%" PY_FORMAT_SIZE_T "u), ", compact->wstr_length);
         if (!ascii->state.compact && compact->utf8 == unicode->data.any)
             printf("shared ");
         printf("utf8=%p (%" PY_FORMAT_SIZE_T "u)",
-               compact->utf8, compact->utf8_length);
+               (void *)compact->utf8, compact->utf8_length);
     }
     printf(", data=%p\n", data);
 }
diff --git a/Programs/_freeze_importlib.c b/Programs/_freeze_importlib.c
index 0818012..4b2ed70 100644
--- a/Programs/_freeze_importlib.c
+++ b/Programs/_freeze_importlib.c
@@ -127,7 +127,7 @@
         size_t i, end = Py_MIN(n + 16, data_size);
         fprintf(outfile, "    ");
         for (i = n; i < end; i++) {
-            fprintf(outfile, "%d,", (unsigned int) data[i]);
+            fprintf(outfile, "%u,", (unsigned int) data[i]);
         }
         fprintf(outfile, "\n");
     }
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index fbdeb9b..1290164 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1750,7 +1750,7 @@
 
     PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
     return node;
-};
+}
 
 static int
 _append_preinit_entry(_Py_PreInitEntry *optionlist, const wchar_t *value)
@@ -1772,7 +1772,7 @@
         last_entry->next = new_entry;
     }
     return 0;
-};
+}
 
 static void
 _clear_preinit_entries(_Py_PreInitEntry *optionlist)
@@ -1789,7 +1789,7 @@
         current = next;
     }
     PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
-};
+}
 
 static void
 _clear_all_preinit_options(void)
@@ -1820,7 +1820,7 @@
 
     _clear_all_preinit_options();
     return 0;
-};
+}
 
 static PyObject *
 get_warnoptions(void)
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 1f4f36d..4c106d9 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -339,7 +339,7 @@
         }
     }
 
-    dprintf(("PyThread_allocate_lock() -> %p\n", lock));
+    dprintf(("PyThread_allocate_lock() -> %p\n", (void *)lock));
     return (PyThread_type_lock)lock;
 }
 
@@ -521,7 +521,7 @@
         }
     }
 
-    dprintf(("PyThread_allocate_lock() -> %p\n", lock));
+    dprintf(("PyThread_allocate_lock() -> %p\n", (void *)lock));
     return (PyThread_type_lock) lock;
 }