diff --git a/plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/codescan/sessionconfig/CodeScanSessionConfig.kt b/plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/codescan/sessionconfig/CodeScanSessionConfig.kt
index 952c46c0d0..c6cf9205ea 100644
--- a/plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/codescan/sessionconfig/CodeScanSessionConfig.kt
+++ b/plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/codescan/sessionconfig/CodeScanSessionConfig.kt
@@ -169,7 +169,7 @@ class CodeScanSessionConfig(
                 append("+++ b/")
                 append(project.name)
                 append('/')
-                append(fileNio.relativeTo(projectRootNio).pathString)
+                append(fileNio.relativeTo(projectRootNio).toString().replace(File.separator, "/"))
             }
         } catch (e: Exception) {
             LOG.debug(e) { "Failed to create git diff" }