diff --git a/jemi.c b/jemi.c
index a037c5b..fcd78c6 100644
--- a/jemi.c
+++ b/jemi.c
@@ -147,6 +147,14 @@ jemi_node_t *jemi_integer(int64_t value) {
     return node;
 }
 
+jemi_node_t *jemi_uinteger(uint64_t value) {
+    jemi_node_t *node = jemi_alloc(JEMI_UINTEGER);
+    if (node) {
+        node->uinteger = value;
+    }
+    return node;
+}
+
 jemi_node_t *jemi_string(const char *string) {
     jemi_node_t *node = jemi_alloc(JEMI_STRING);
     if (node) {
@@ -337,6 +345,12 @@ static void emit_aux(jemi_node_t *root, jemi_writer_t writer_fn, void *arg,
             emit_string(writer_fn, arg, buf);
         } break;
 
+        case JEMI_UINTEGER: {
+            char buf[22]; // 21 digits, 1 null
+            snprintf(buf, sizeof(buf), "%llu", node->uinteger);
+            emit_string(writer_fn, arg, buf);
+        } break;
+
         case JEMI_STRING: {
             writer_fn('"', arg);
             emit_string(writer_fn, arg, node->string);
@@ -380,6 +394,9 @@ static jemi_node_t *copy_node(jemi_node_t *node) {
         case JEMI_INTEGER: {
             copy->integer = node->integer;
         }
+        case JEMI_UINTEGER: {
+            copy->uinteger = node->uinteger;
+        }
         default: {
             // no action needed
         }
diff --git a/jemi.h b/jemi.h
index 6741b92..daeb347 100644
--- a/jemi.h
+++ b/jemi.h
@@ -56,6 +56,7 @@ typedef enum {
     JEMI_ARRAY,
     JEMI_FLOAT,
     JEMI_INTEGER,
+    JEMI_UINTEGER,
     JEMI_STRING,
     JEMI_TRUE,
     JEMI_FALSE,
@@ -69,6 +70,7 @@ typedef struct _jemi_node {
         struct _jemi_node *children; // for JEMI_ARRAY or JEMI_OBJECT
         double number;               // for JEMI_FLOAT
         int64_t integer;             // for JEMI_INTEGER
+        uint64_t uinteger;           // for JEMI_UINTEGER
         const char *string;          // for JEMI_STRING
     };
 } jemi_node_t;
@@ -143,6 +145,7 @@ jemi_node_t *jemi_float(double value);
  * more compactly than using jemi_float().
  */
 jemi_node_t *jemi_integer(int64_t value);
+jemi_node_t *jemi_uinteger(uint64_t value);
 
 /**
  * @brief Create a JSON string.