diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c
index 9b7fbb080b..5475c073d3 100644
--- a/src/conf/cpu_conf.c
+++ b/src/conf/cpu_conf.c
@@ -496,7 +496,7 @@ virCPUDefParseXML(xmlNodePtr node,
                 goto error;
             }
 
-            ret = virStrToLong_ui(memory, NULL, 10, &def->cells[cur_cell].mem);
+            ret = virStrToLong_ull(memory, NULL, 10, &def->cells[cur_cell].mem);
             if (ret == -1) {
                 virReportError(VIR_ERR_XML_ERROR, "%s",
                                _("Invalid 'memory' attribute in NUMA cell"));
@@ -702,7 +702,7 @@ virCPUDefFormatBuf(virBufferPtr buf,
             virBufferAddLit(buf, "<cell");
             virBufferAsprintf(buf, " id='%zu'", i);
             virBufferAsprintf(buf, " cpus='%s'", def->cells[i].cpustr);
-            virBufferAsprintf(buf, " memory='%d'", def->cells[i].mem);
+            virBufferAsprintf(buf, " memory='%llu'", def->cells[i].mem);
             if (memAccess)
                 virBufferAsprintf(buf, " memAccess='%s'",
                                   virMemAccessTypeToString(memAccess));
diff --git a/src/conf/cpu_conf.h b/src/conf/cpu_conf.h
index d45210be3e..5bcf10178b 100644
--- a/src/conf/cpu_conf.h
+++ b/src/conf/cpu_conf.h
@@ -105,7 +105,7 @@ typedef virCellDef *virCellDefPtr;
 struct _virCellDef {
     virBitmapPtr cpumask; /* CPUs that are part of this node */
     char *cpustr;         /* CPUs stored in string form for dumpxml */
-    unsigned int mem;     /* Node memory in kB */
+    unsigned long long mem;     /* Node memory in kB */
     virMemAccess memAccess;
 };
 
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 917639e0db..13b54dd02f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6693,7 +6693,7 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
     }
 
     for (i = 0; i < def->cpu->ncells; i++) {
-        int cellmem = VIR_DIV_UP(def->cpu->cells[i].mem, 1024);
+        unsigned long long cellmem = VIR_DIV_UP(def->cpu->cells[i].mem, 1024);
         def->cpu->cells[i].mem = cellmem * 1024;
         virMemAccess memAccess = def->cpu->cells[i].memAccess;
 
@@ -6799,7 +6799,7 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
                 virBufferAddLit(&buf, "memory-backend-ram");
             }
 
-            virBufferAsprintf(&buf, ",size=%dM,id=ram-node%zu", cellmem, i);
+            virBufferAsprintf(&buf, ",size=%lluM,id=ram-node%zu", cellmem, i);
 
             if (virDomainNumatuneMaybeFormatNodeset(def->numatune, nodeset,
                                                     &nodemask, i) < 0)
@@ -6849,7 +6849,7 @@ qemuBuildNumaArgStr(virQEMUDriverConfigPtr cfg,
             virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_MEMORY_FILE)) {
             virBufferAsprintf(&buf, ",memdev=ram-node%zu", i);
         } else {
-            virBufferAsprintf(&buf, ",mem=%d", cellmem);
+            virBufferAsprintf(&buf, ",mem=%llu", cellmem);
         }
 
         virCommandAddArgBuffer(cmd, &buf);