diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
index 5b22fbdbadb3..917342f9bbf6 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
@@ -15,6 +15,7 @@ import java.io.File;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.regex.Matcher;
 
 import org.apache.commons.lang3.StringUtils;
 
@@ -129,7 +130,7 @@ public class PhpClientCodegen extends DefaultCodegen implements CodegenConfig {
 
         return (getPackagePath() + File.separatorChar + basePath
                     // Replace period, backslash, forward slash with file separator in package name
-                    + packageName.replaceAll("[\\.\\\\/]", File.separator)
+                    + packageName.replaceAll("[\\.\\\\/]", Matcher.quoteReplacement(File.separator))
                     // Trim prefix file separators from package path
                     .replaceAll(regFirstPathSeparator, ""))
                     // Trim trailing file separators from the overall path