diff --git a/samples/client/echo_api/r/build_and_test.bash b/samples/client/echo_api/r/build_and_test.bash
index 730dd53024a..40888c9286e 100644
--- a/samples/client/echo_api/r/build_and_test.bash
+++ b/samples/client/echo_api/r/build_and_test.bash
@@ -23,4 +23,4 @@ mkdir $R_LIBS_USER || true
 #
 R CMD build .
 R CMD check *tar.gz --no-manual
-R CMD install --preclean *tar.gz
+R CMD INSTALL --preclean *tar.gz
diff --git a/samples/client/petstore/R-httr2-wrapper/build_and_test.bash b/samples/client/petstore/R-httr2-wrapper/build_and_test.bash
index 2079f75da03..90e8fc71c9c 100644
--- a/samples/client/petstore/R-httr2-wrapper/build_and_test.bash
+++ b/samples/client/petstore/R-httr2-wrapper/build_and_test.bash
@@ -23,4 +23,4 @@ rm petstore_1.0.0.tar.gz || true
 
 R CMD build .
 R CMD check *tar.gz --no-manual
-R CMD install --preclean *tar.gz
+R CMD INSTALL --preclean *tar.gz
diff --git a/samples/client/petstore/R-httr2/build_and_test.bash b/samples/client/petstore/R-httr2/build_and_test.bash
index 2079f75da03..90e8fc71c9c 100644
--- a/samples/client/petstore/R-httr2/build_and_test.bash
+++ b/samples/client/petstore/R-httr2/build_and_test.bash
@@ -23,4 +23,4 @@ rm petstore_1.0.0.tar.gz || true
 
 R CMD build .
 R CMD check *tar.gz --no-manual
-R CMD install --preclean *tar.gz
+R CMD INSTALL --preclean *tar.gz
diff --git a/samples/client/petstore/R/build_and_test.bash b/samples/client/petstore/R/build_and_test.bash
index 21baf21970d..52cd6d1b838 100644
--- a/samples/client/petstore/R/build_and_test.bash
+++ b/samples/client/petstore/R/build_and_test.bash
@@ -25,4 +25,4 @@ rm petstore_1.0.0.tar.gz || true
 
 R CMD build .
 R CMD check *tar.gz --no-manual
-R CMD install --preclean *tar.gz
+R CMD INSTALL --preclean *tar.gz