diff --git a/src/Makevars b/src/Makevars
index 2ac7d523..cd590ce9 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1 +1,2 @@
+PKG_CPPFLAGS = -DRCPP_NO_MASK_RF_ERROR
 PKG_LIBS = -lpng -lz
diff --git a/src/Makevars.ucrt b/src/Makevars.ucrt
index af9a03b9..0a6e431c 100644
--- a/src/Makevars.ucrt
+++ b/src/Makevars.ucrt
@@ -5,4 +5,5 @@ else
   PKG_LIBS = $(shell pkg-config --libs libpng)
 endif
 
-PKG_CPPFLAGS += -DSTRICT_R_HEADERS
+PKG_CPPFLAGS += -DSTRICT_R_HEADERS \
+  -DRCPP_NO_MASK_RF_ERROR
diff --git a/src/Makevars.win b/src/Makevars.win
index 2d4efc90..882c9f28 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,7 +1,8 @@
 RWINLIB = ../windows/harfbuzz-2.7.4
 
 PKG_CPPFLAGS = -I${RWINLIB}/include \
-	-DSTRICT_R_HEADERS
+	-DSTRICT_R_HEADERS \
+	-DRCPP_NO_MASK_RF_ERROR
 
 PKG_LIBS = -L${RWINLIB}/lib${R_ARCH}${CRT} -lpng -lz