diff --git a/tools/xfsslower.py b/tools/xfsslower.py
index ef79a8947cb8..ef4b6b5b01fc 100755
--- a/tools/xfsslower.py
+++ b/tools/xfsslower.py
@@ -186,8 +186,11 @@
 
     // populate output struct
     u32 size = PT_REGS_RC(ctx);
-    struct data_t data = {.type = type, .size = size, .delta_us = delta_us,
-        .pid = pid};
+    struct data_t data = {};
+    data.type = type;
+    data.size = size;
+    data.delta_us = delta_us;
+    data.pid = pid;
     data.ts_us = ts / 1000;
     data.offset = valp->offset;
     bpf_get_current_comm(&data.task, sizeof(data.task));