diff --git a/src/Makefile.in b/src/Makefile.in
index 2d96983..92f434a 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -32,7 +32,7 @@ endif
 SCREENENCODINGS = $(datadir)/screen/utf8encodings
 
 CC = @CC@
-CFLAGS = @CFLAGS@ -Wall -Wextra -std=c11
+CFLAGS = @CFLAGS@ -Wall -Wextra -std=c17
 CPPFLAGS = @CPPFLAGS@ -iquote. -DSCREENENCODINGS='"$(SCREENENCODINGS)"' -DBUILD_DATE='"$(BUILD_DATE)"'
 LDFLAGS = @LDFLAGS@
 LIBS = @LIBS@