diff --git a/src/CollectorList.h b/src/CollectorList.h
index 365d27f8f..249cf08b2 100644
--- a/src/CollectorList.h
+++ b/src/CollectorList.h
@@ -1,3 +1,4 @@
+#include <R.h>
 #include <Rinternals.h>
 
 class CollectorList {
diff --git a/src/dir.cc b/src/dir.cc
index d1f0bb891..24f7d78a4 100644
--- a/src/dir.cc
+++ b/src/dir.cc
@@ -9,6 +9,7 @@
 #undef ERROR
 
 #include "CollectorList.h"
+#include "R.h"
 #include "Rinternals.h"
 #include "error.h"
 #include "utils.h"
diff --git a/src/error.h b/src/error.h
index 9aa5dca33..0218c7048 100644
--- a/src/error.h
+++ b/src/error.h
@@ -2,6 +2,7 @@
 #define ERROR_H_
 
 #define R_NO_REMAP
+#include <R.h>
 #include <Rinternals.h>
 #undef R_NO_REMAP
 
diff --git a/src/file.cc b/src/file.cc
index 202be46a7..0a697d86c 100644
--- a/src/file.cc
+++ b/src/file.cc
@@ -14,6 +14,7 @@
 #include <pwd.h>
 #endif
 
+#include <R.h>
 #include <Rinternals.h>
 
 #include "getmode.h"
diff --git a/src/fs.cc b/src/fs.cc
index 27340681b..0ac8ff44f 100644
--- a/src/fs.cc
+++ b/src/fs.cc
@@ -1,3 +1,4 @@
+#include "R.h"
 #include "Rinternals.h"
 #include "uv.h"
 
diff --git a/src/getmode.h b/src/getmode.h
index fbc89f9c9..a5a6c0ee0 100644
--- a/src/getmode.h
+++ b/src/getmode.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #define R_NO_REMAP
+#include <R.h>
 #include <Rinternals.h>
 #undef R_NO_REMAP
 
diff --git a/src/id.cc b/src/id.cc
index b07fe723f..dd06dcc9a 100644
--- a/src/id.cc
+++ b/src/id.cc
@@ -9,6 +9,7 @@
 #include <unistd.h>
 #endif
 
+#include <R.h>
 #include <Rinternals.h>
 
 #include "utils.h"
diff --git a/src/init.cc b/src/init.cc
index a21626b04..aa670d5c5 100644
--- a/src/init.cc
+++ b/src/init.cc
@@ -1,6 +1,7 @@
 #include <stdlib.h> // for NULL
 #include <R.h>
 #include <R_ext/Rdynload.h>
+#include <R.h>
 #include <Rinternals.h>
 
 /* FIXME:
diff --git a/src/link.cc b/src/link.cc
index 566540ae5..91bb96621 100644
--- a/src/link.cc
+++ b/src/link.cc
@@ -1,6 +1,7 @@
 
 #include <cstring>
 
+#include "R.h"
 #include "Rinternals.h"
 #include "error.h"
 #include "utils.h"
diff --git a/src/path.cc b/src/path.cc
index 63fa2ff27..90275116b 100644
--- a/src/path.cc
+++ b/src/path.cc
@@ -4,6 +4,7 @@
 #include <cstring>
 #include <string>
 
+#include "R.h"
 #include "Rinternals.h"
 #include "error.h"
 #include "utils.h"
diff --git a/src/unix/getmode.cc b/src/unix/getmode.cc
index 7cbcf508e..f2af13854 100644
--- a/src/unix/getmode.cc
+++ b/src/unix/getmode.cc
@@ -10,6 +10,7 @@
 #include "bsd/unistd.h" /* for getmode / setmode */
 #endif
 
+#include <R.h>
 #include <Rinternals.h> /* for Rf_error */
 
 #include <sys/stat.h>
diff --git a/src/windows/getmode.cc b/src/windows/getmode.cc
index e18c40931..4e84b1643 100644
--- a/src/windows/getmode.cc
+++ b/src/windows/getmode.cc
@@ -1,6 +1,7 @@
 #include "getmode.h"
 #include <sys/stat.h>
 
+#include <R.h>
 #include <Rinternals.h> /* for Rf_error */
 
 /* code adapted from https://cgit.freedesktop.org/libbsd/tree/src/setmode.c */