diff --git a/fuzz/fuzz_union.c b/fuzz/fuzz_union.c
new file mode 100644
index 00000000..c759020c
--- /dev/null
+++ b/fuzz/fuzz_union.c
@@ -0,0 +1,36 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "isl/ctx.h"
+#include "isl/union_set.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+	char* data_cstr = strndup(data, size);
+
+	if (data_cstr == NULL) {
+		return 0;
+	}
+
+	isl_ctx* ctx = isl_ctx_alloc();
+	isl_union_map_read_from_str(ctx, data_cstr);
+	isl_union_set_read_from_str(ctx, data_cstr);
+
+	if (size > 10) {
+		data += 5;
+		size -= 5;
+		char *data_cstr2 = strndup(data, size);
+
+		isl_union_set* tmp_set = isl_union_set_read_from_str(ctx, data_cstr);
+		isl_union_map* tmp_map = isl_union_map_read_from_str(ctx, data_cstr2);
+
+		isl_union_map_intersect_domain(tmp_map, tmp_set);
+		free(data_cstr2);
+	}
+
+	isl_ctx_free(ctx);
+	free(data_cstr);
+
+	return 0;
+}