diff --git a/crates/ruff_linter/resources/test/fixtures/pycodestyle/E20.py b/crates/ruff_linter/resources/test/fixtures/pycodestyle/E20.py
index 2817f2ef9b6f8..01d49e2930c51 100644
--- a/crates/ruff_linter/resources/test/fixtures/pycodestyle/E20.py
+++ b/crates/ruff_linter/resources/test/fixtures/pycodestyle/E20.py
@@ -153,3 +153,9 @@
 
 #: E203:1:13
 ham[lower + 1  :, "columnname"]
+
+#: Okay
+f"{ham[lower +1 :, "columnname"]}"
+
+#: E203:1:13
+f"{ham[lower + 1  :, "columnname"]}"
diff --git a/crates/ruff_linter/src/rules/pycodestyle/rules/logical_lines/extraneous_whitespace.rs b/crates/ruff_linter/src/rules/pycodestyle/rules/logical_lines/extraneous_whitespace.rs
index 3f568cf99dc06..216592973e67d 100644
--- a/crates/ruff_linter/src/rules/pycodestyle/rules/logical_lines/extraneous_whitespace.rs
+++ b/crates/ruff_linter/src/rules/pycodestyle/rules/logical_lines/extraneous_whitespace.rs
@@ -137,16 +137,16 @@ pub(crate) fn extraneous_whitespace(line: &LogicalLine, context: &mut LogicalLin
         match kind {
             TokenKind::FStringStart => fstrings += 1,
             TokenKind::FStringEnd => fstrings = fstrings.saturating_sub(1),
-            TokenKind::Lsqb if fstrings == 0 => {
+            TokenKind::Lsqb => {
                 brackets.push(kind);
             }
-            TokenKind::Rsqb if fstrings == 0 => {
+            TokenKind::Rsqb => {
                 brackets.pop();
             }
-            TokenKind::Lbrace if fstrings == 0 => {
+            TokenKind::Lbrace => {
                 brackets.push(kind);
             }
-            TokenKind::Rbrace if fstrings == 0 => {
+            TokenKind::Rbrace => {
                 brackets.pop();
             }
             _ => {}
diff --git a/crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E203_E20.py.snap b/crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E203_E20.py.snap
index 01c7ebc0713f6..c70c11d79c8ba 100644
--- a/crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E203_E20.py.snap
+++ b/crates/ruff_linter/src/rules/pycodestyle/snapshots/ruff_linter__rules__pycodestyle__tests__E203_E20.py.snap
@@ -251,6 +251,8 @@ E20.py:155:14: E203 [*] Whitespace before ':'
 154 | #: E203:1:13
 155 | ham[lower + 1  :, "columnname"]
     |              ^^ E203
+156 | 
+157 | #: Okay
     |
     = help: Remove whitespace before ':'
 
@@ -260,3 +262,21 @@ E20.py:155:14: E203 [*] Whitespace before ':'
 154 154 | #: E203:1:13
 155     |-ham[lower + 1  :, "columnname"]
     155 |+ham[lower + 1:, "columnname"]
+156 156 | 
+157 157 | #: Okay
+158 158 | f"{ham[lower +1 :, "columnname"]}"
+
+E20.py:161:17: E203 [*] Whitespace before ':'
+    |
+160 | #: E203:1:13
+161 | f"{ham[lower + 1  :, "columnname"]}"
+    |                 ^^ E203
+    |
+    = help: Remove whitespace before ':'
+
+ℹ Safe fix
+158 158 | f"{ham[lower +1 :, "columnname"]}"
+159 159 | 
+160 160 | #: E203:1:13
+161     |-f"{ham[lower + 1  :, "columnname"]}"
+    161 |+f"{ham[lower + 1:, "columnname"]}"