diff --git a/.github/actions/check-pharmr/action.yml b/.github/actions/check-pharmr/action.yml
index 3f1e7f6..ace60ba 100644
--- a/.github/actions/check-pharmr/action.yml
+++ b/.github/actions/check-pharmr/action.yml
@@ -44,10 +44,12 @@ runs:
         commit = subprocess.getoutput("git -C ../pharmpy_repo rev-parse HEAD")
         with open("R/install.R", "r") as fp:
             lines = fp.readlines()
-        lines[0] = f'"{commit}"\n'
         with open("R/install.R", "w") as fp:
             for line in lines:
-                fp.write(line)
+                if line.lstrip().startswith("PHARMPY_COMMIT"):
+                    fp.write(f'    PHARMPY_COMMIT <- "{commit}"\n)'
+                else:
+                    fp.write(line)
       shell: python
 
     - name: Build source package
diff --git a/R/install.R b/R/install.R
index 63f8797..6ab605f 100644
--- a/R/install.R
+++ b/R/install.R
@@ -1,6 +1,3 @@
-"d94f63dc63417b6824267680ba6216c1d8e6551c"
-PHARMPY_COMMIT <- .Last.value
-
 #' @title
 #' Install Pharmpy
 #' 
@@ -31,6 +28,7 @@ install_pharmpy_devel <- function(envname='r-reticulate', method='auto', version
   if (version == 'latest') {
     pharmpy_to_install <- 'pharmpy-core'
   } else if (version == 'devel') {
+    PHARMPY_COMMIT <- "d94f63dc63417b6824267680ba6216c1d8e6551c"
     pharmpy_to_install <- paste0('git+https://github.com/pharmpy/pharmpy.git@', PHARMPY_COMMIT)
   } else { 
     if (version == 'same') {