diff --git a/migration-engine/connectors/migration-connector/src/lib.rs b/migration-engine/connectors/migration-connector/src/lib.rs
index 1d9b8d0a3925..6b44912ebc69 100644
--- a/migration-engine/connectors/migration-connector/src/lib.rs
+++ b/migration-engine/connectors/migration-connector/src/lib.rs
@@ -93,11 +93,17 @@ fn checksum(script: &str) -> String {
     checksum.format_checksum()
 }
 
+/// The length (in bytes, or equivalently ascii characters) of the checksum
+/// strings.
+const CHECKSUM_STR_LEN: usize = 64;
+
 /// Format a checksum to a hexadecimal string. This is used to checksum
 /// migration scripts with Sha256.
 pub trait FormatChecksum {
     /// Format a checksum to a hexadecimal string.
     fn format_checksum(&self) -> String;
+    /// Obsolete checksum method, should only be used for compatibility.
+    fn format_checksum_old(&self) -> String;
 }
 
 impl FormatChecksum for [u8; 32] {
@@ -106,6 +112,26 @@ impl FormatChecksum for [u8; 32] {
 
         let mut checksum_string = String::with_capacity(32 * 2);
 
+        for byte in self {
+            write!(checksum_string, "{:02x}", byte).unwrap();
+        }
+
+        assert_eq!(checksum_string.len(), CHECKSUM_STR_LEN);
+
+        checksum_string
+    }
+
+    // Due to an omission in a previous version of the migration engine,
+    // some migrations tables will have old migrations with checksum strings
+    // that have not been zero-padded.
+    //
+    // Corresponding issue:
+    // https://github.com/prisma/prisma-engines/issues/1887
+    fn format_checksum_old(&self) -> String {
+        use std::fmt::Write as _;
+
+        let mut checksum_string = String::with_capacity(32 * 2);
+
         for byte in self {
             write!(checksum_string, "{:x}", byte).unwrap();
         }
@@ -113,3 +139,14 @@ impl FormatChecksum for [u8; 32] {
         checksum_string
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn format_checksum_does_not_strip_zeros() {
+        assert_eq!(checksum("hello"), "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
+        assert_eq!(checksum("abcd").len(), CHECKSUM_STR_LEN);
+    }
+}
\ No newline at end of file
diff --git a/migration-engine/connectors/migration-connector/src/migrations_directory.rs b/migration-engine/connectors/migration-connector/src/migrations_directory.rs
index 5417e8f70517..7d69a9365ad6 100644
--- a/migration-engine/connectors/migration-connector/src/migrations_directory.rs
+++ b/migration-engine/connectors/migration-connector/src/migrations_directory.rs
@@ -5,7 +5,7 @@
 //! It also contains multiple subfolders, named after the migration id, and each containing:
 //! - A migration script
 
-use crate::{ConnectorError, ConnectorResult, FormatChecksum};
+use crate::{CHECKSUM_STR_LEN, ConnectorError, ConnectorResult, FormatChecksum};
 use sha2::{Digest, Sha256, Sha512};
 use std::{
     error::Error,
@@ -221,7 +221,19 @@ impl MigrationDirectory {
         hasher.update(&filesystem_script);
         let filesystem_script_checksum: [u8; 32] = hasher.finalize().into();
 
-        Ok(checksum_str == filesystem_script_checksum.format_checksum())
+        // Due to an omission in a previous version of the migration engine,
+        // some migrations tables will have old migrations with checksum strings
+        // that have not been zero-padded.
+        //
+        // Corresponding issue:
+        // https://github.com/prisma/prisma-engines/issues/1887
+        let filesystem_script_checksum_str = if checksum_str.len() > 0 && checksum_str.len() != CHECKSUM_STR_LEN {
+            filesystem_script_checksum.format_checksum_old()
+        } else {
+            filesystem_script_checksum.format_checksum()
+        };
+
+        Ok(checksum_str == filesystem_script_checksum_str)
     }
 
     /// Write the migration script to the directory.