diff --git a/README.md b/README.md
index 3a03b62..4ec006f 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ The shell will expand wildcards. By default, thumbnails and file names will be d
 
 ### All platforms: Build from source
 
-Our makefile currently only supports `g++`. It should be possible to compile `tiv` manually using any of your favorite compilers that support C++20 and Unix headers (`ioctl.h`, specifically) or `windows.h`. PRs are welcome.
+Our makefile currently only supports `g++`. It should be possible to compile `tiv` manually using any of your favorite compilers that support C++17 and Unix headers (`ioctl.h` and `sysexits.h`, specifically) or `windows.h`. PRs are welcome.
 
 ```sh
 git clone https://github.com/stefanhaustein/TerminalImageViewer.git
diff --git a/src/Makefile b/src/Makefile
index b5786f8..6da40ed 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -12,7 +12,7 @@ prefix      ?= /usr/local
 exec_prefix ?= $(prefix)
 bindir      ?= $(exec_prefix)/bin
 
-override CXXFLAGS += -std=c++2a -Wall -fexceptions
+override CXXFLAGS += -std=c++17 -Wall -fexceptions
 override LDFLAGS  += -pthread
 
 all: $(PROGNAME)