diff --git a/src/r_utils.h b/src/r_utils.h
index fc5926fd..d01a123b 100644
--- a/src/r_utils.h
+++ b/src/r_utils.h
@@ -9,6 +9,16 @@
 #include <string>
 #include <vector>
 
+#ifdef R_VERSION
+#  if (R_VERSION >= R_Version(4, 4, 0))
+#    define R_PRIdXLEN_T "td"
+#  else
+#    define R_PRIdXLEN_T "d"
+#  endif
+#else
+#  define R_PRIdXLEN_T "d"
+#endif
+
 namespace vroom {
 
 inline std::string
diff --git a/src/vroom_big_int.h b/src/vroom_big_int.h
index eaa2bba0..0f352634 100644
--- a/src/vroom_big_int.h
+++ b/src/vroom_big_int.h
@@ -7,6 +7,7 @@
 constexpr long long NA_INTEGER64 = 0x8000000000000000LL;
 
 #include "vroom.h"
+#include "r_utils.h"
 
 namespace cpp11 {
 inline bool is_na(long long x) { return x == NA_INTEGER64; }
@@ -56,9 +57,10 @@ class vroom_big_int : public vroom_vec {
   static Rboolean
   Inspect(SEXP x, int, int, int, void (*)(SEXP, int, int, int)) {
     Rprintf(
-        "vroom_big_int (len=%d, materialized=%s)\n",
-        Length(x),
-        R_altrep_data2(x) != R_NilValue ? "T" : "F");
+      "vroom_big_int (len=%" R_PRIdXLEN_T ", materialized=%s)\n",
+      Length(x),
+      R_altrep_data2(x) != R_NilValue ? "T" : "F");
+
     return TRUE;
   }