diff --git a/src/handlers/graphical.rs b/src/handlers/graphical.rs
index 9c1d7ab..f9ab4cc 100644
--- a/src/handlers/graphical.rs
+++ b/src/handlers/graphical.rs
@@ -1196,9 +1196,9 @@ impl GraphicalReportHandler {
         let mut column = context_data.column();
         let mut offset = context_data.span().offset();
         let mut line_offset = offset;
+        let mut line_str = String::with_capacity(context.len());
+        let mut lines = Vec::with_capacity(1);
         let mut iter = context.chars().peekable();
-        let mut line_str = String::new();
-        let mut lines = Vec::new();
         while let Some(char) = iter.next() {
             offset += char.len_utf8();
             let mut at_end_of_file = false;
diff --git a/src/handlers/narratable.rs b/src/handlers/narratable.rs
index c809124..f8d36ae 100644
--- a/src/handlers/narratable.rs
+++ b/src/handlers/narratable.rs
@@ -295,9 +295,9 @@ impl NarratableReportHandler {
         let mut column = context_data.column();
         let mut offset = context_data.span().offset();
         let mut line_offset = offset;
+        let mut line_str = String::with_capacity(context.len());
+        let mut lines = Vec::with_capacity(1);
         let mut iter = context.chars().peekable();
-        let mut line_str = String::new();
-        let mut lines = Vec::new();
         while let Some(char) = iter.next() {
             offset += char.len_utf8();
             let mut at_end_of_file = false;