diff --git a/Cargo.toml b/Cargo.toml
index 5c24e963..4938d02d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,6 +37,7 @@ zopfli = "^0.4.0"
 miniz_oxide = "0.2.0"
 rgb = "0.8.11"
 
+
 [dependencies.rayon]
 optional = true
 version = "^1.0.0"
diff --git a/src/reduction/alpha.rs b/src/reduction/alpha.rs
index f0e62e22..b255e9f7 100644
--- a/src/reduction/alpha.rs
+++ b/src/reduction/alpha.rs
@@ -97,7 +97,7 @@ fn reduced_alpha_to_up(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
     scan_lines.reverse();
     let mut lines = Vec::with_capacity(scan_lines.len());
     let mut last_line = Vec::new();
-    let mut current_line = Vec::with_capacity(scan_lines[0].data.len());
+    let mut current_line = Vec::with_capacity(scan_lines[0].data.len() + 1); // filter size + pixels
     for line in scan_lines {
         if line.data.len() != last_line.len() {
             last_line = vec![0; line.data.len()];