diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 124c3fcd5..14639f49f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -98,7 +98,7 @@ jobs:
         make -f Makefile.manual test
         make -f Makefile.manual clean
       env:
-        FYPPFLAGS: "-DMAXRANK=4"
+        ADD_FYPPFLAGS: "-DMAXRANK=4"
 
   intel-build:
     runs-on: ${{ matrix.os }}
diff --git a/Makefile.manual b/Makefile.manual
index c6b437295..559426850 100644
--- a/Makefile.manual
+++ b/Makefile.manual
@@ -2,14 +2,16 @@
 
 FC ?= gfortran
 FFLAGS ?= -Wall -Wextra -Wimplicit-interface -fPIC -g -fcheck=all
-FYPPFLAGS ?=
+ADD_FYPPFLAGS ?=
 
 VERSION := $(subst ., ,$(file < VERSION))
-FYPPFLAGS += \
+VERSION_FYPPFLAGS += \
              -DPROJECT_VERSION_MAJOR=$(word 1,$(VERSION)) \
              -DPROJECT_VERSION_MINOR=$(word 2,$(VERSION)) \
              -DPROJECT_VERSION_PATCH=$(word 3,$(VERSION))
 
+FYPPFLAGS := $(ADD_FYPPFLAGS) $(VERSION_FYPPFLAGS)
+
 export FC
 export FFLAGS
 export FYPPFLAGS
diff --git a/README.md b/README.md
index f7f70aaba..837aff087 100644
--- a/README.md
+++ b/README.md
@@ -176,15 +176,15 @@ Alternatively, you can build using provided Makefiles:
 make -f Makefile.manual
 ```
 
-You can limit the maximum rank by setting ``-DMAXRANK=<num>`` in the ``FYPPFLAGS`` environment variable (which can reduce the compilation time):
+You can limit the maximum rank by setting ``-DMAXRANK=<num>`` in the ``ADD_FYPPFLAGS`` environment variable (which can reduce the compilation time):
 
 ```sh
-make -f Makefile.manual FYPPFLAGS=-DMAXRANK=4
+make -f Makefile.manual ADD_FYPPFLAGS=-DMAXRANK=4
 ```
 
 You can also specify the compiler and compiler-flags by setting the ``FC`` and ``FFLAGS`` environmental variables. Among other things, this facilitates use of compiler optimizations that are not specified in the Makefile.manual defaults.
 ```sh
-make -f Makefile.manual FYPPFLAGS=-DMAXRANK=4 FC=gfortran FFLAGS="-O3 -flto"
+make -f Makefile.manual ADD_FYPPFLAGS=-DMAXRANK=4 FC=gfortran FFLAGS="-O3 -flto"
 ```
 
 ### Build with [fortran-lang/fpm](https://github.com/fortran-lang/fpm)