diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc8f1b38..b7e9763c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,6 +86,10 @@ target_link_libraries( ${PROJECT_NAME} PRIVATE ${JULIA_LIBRARY} MPI::MPI_C )
 # Set appropriate compile flags
 target_compile_options( ${PROJECT_NAME} PUBLIC "-fPIC" )
 target_compile_options( ${PROJECT_NAME} PRIVATE -Wall -Wextra -Werror)
+# Require C11 standard with GNU extensions for C files
+target_compile_options( ${PROJECT_NAME} PRIVATE $<$<COMPILE_LANGUAGE:C>:-std=gnu11>)
+# Require Fortran 2018 standard for Fortran files
+target_compile_options( ${PROJECT_NAME} PRIVATE $<$<COMPILE_LANGUAGE:Fortran>:-std=f2018>)
 
 
 
diff --git a/README.md b/README.md
index 88a3def5..f07d49e9 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ Currently, libtrixi is only developed and tested for Linux.
 Furthermore, a local installation of `MPI`,
 [`t8code`](https://github.com/DLR-AMR/t8code), and
 [`Julia`](https://julialang.org/downloads/platform/) is required.
+Furthermore, a C11-compatible C compiler and a Fortran 2018-compatible Fortran compiler are
+necessary to build the C library and its Fortran bindings.
 
 ### Get the sources
 
diff --git a/docs/src/index.md b/docs/src/index.md
index 691e8140..5996e4bd 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -20,6 +20,8 @@ Currently, libtrixi is only developed and tested for Linux.
 Furthermore, a local installation of `MPI`,
 [`t8code`](https://github.com/DLR-AMR/t8code), and
 [`Julia`](https://julialang.org/downloads/platform/) is required.
+Furthermore, a C11-compatible C compiler and a Fortran 2018-compatible Fortran compiler are
+necessary to build the C library and its Fortran bindings.
 
 ### Get the sources