diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java
index 9fb5b8f3ef5b..0e594e177285 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java
@@ -422,9 +422,12 @@ public void execute(Template.Fragment fragment, Writer writer) throws IOExceptio
                 content = content.trim().replace("v", "");
                 content = content.replace("V", "");
 
-                // convert 5.2 to 5.2.0 for example
                 String[] contents = content.split("[.]");
-                if (contents.length == 2) {
+                if (contents.length == 1) {
+                    // convert 5 to 5.0.0 for example
+                    content += ".0.0";
+                } else if (contents.length == 2) {
+                    // convert 5.2 to 5.2.0 for example
                     content += ".0";
                 }