diff --git a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvFileSource.java b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvFileSource.java
index b51f27b61637..28a1bf469c77 100644
--- a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvFileSource.java
+++ b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvFileSource.java
@@ -225,6 +225,9 @@
 	 * Controls whether leading and trailing whitespace characters of unquoted
 	 * CSV columns should be ignored.
 	 *
+	 * <p>Whitespace refers to characters with Unicode code points less than
+	 * or equal to {@code U+0020}, as defined by {@link String#trim()}.
+	 *
 	 * <p>Defaults to {@code true}.
 	 *
 	 * @since 5.8
diff --git a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvReaderFactory.java b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvReaderFactory.java
index 24420b9eef51..004982e7ab02 100644
--- a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvReaderFactory.java
+++ b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvReaderFactory.java
@@ -165,7 +165,7 @@ public String modify(long unusedStartingLineNumber, int unusedFieldIdx, boolean
 			if (!quoted && field.isBlank()) {
 				return NULL_MARKER;
 			}
-			String modifiedField = (!quoted && ignoreLeadingAndTrailingWhitespaces) ? field.strip() : field;
+			String modifiedField = (!quoted && ignoreLeadingAndTrailingWhitespaces) ? field.trim() : field;
 			if (nullValues.contains(modifiedField)) {
 				return NULL_MARKER;
 			}
diff --git a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvSource.java b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvSource.java
index 295add81b394..b8dd46cd5b61 100644
--- a/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvSource.java
+++ b/junit-jupiter-params/src/main/java/org/junit/jupiter/params/provider/CsvSource.java
@@ -286,6 +286,9 @@
 	 * Controls whether leading and trailing whitespace characters of unquoted
 	 * CSV columns should be ignored.
 	 *
+	 * <p>Whitespace refers to characters with Unicode code points less than
+	 * or equal to {@code U+0020}, as defined by {@link String#trim()}.
+	 *
 	 * <p>Defaults to {@code true}.
 	 *
 	 * @since 5.8
diff --git a/jupiter-tests/src/test/java/org/junit/jupiter/params/provider/CsvArgumentsProviderTests.java b/jupiter-tests/src/test/java/org/junit/jupiter/params/provider/CsvArgumentsProviderTests.java
index 4e6eab77eec9..7fb60bc08063 100644
--- a/jupiter-tests/src/test/java/org/junit/jupiter/params/provider/CsvArgumentsProviderTests.java
+++ b/jupiter-tests/src/test/java/org/junit/jupiter/params/provider/CsvArgumentsProviderTests.java
@@ -126,6 +126,17 @@ void trimsTrailingSpaces() {
 		assertThat(arguments).containsExactly(new Object[][] { { "1", "" }, { "2", "" }, { "3", "" }, { "4", "" } });
 	}
 
+	@Test
+	void trimsSpacesUsingStringTrim() {
+		// \u0000 (null) removed by trim(), preserved by strip()
+		// \u00A0 (non-breaking space) preserved by trim(), removed by strip()
+		var annotation = csvSource().lines("\u0000foo,\u00A0bar", "\u0000' foo',\u00A0' bar'").build();
+
+		var arguments = provideArguments(annotation);
+
+		assertThat(arguments).containsExactly(array("foo", "\u00A0bar"), array(" foo", "\u00A0' bar'"));
+	}
+
 	@Test
 	void ignoresLeadingAndTrailingSpaces() {
 		var annotation = csvSource().lines("1,a", "2, b", "3,c ", "4, d ") //