diff --git a/math/complex_numbers.cpp b/math/complex_numbers.cpp
index 10e50b22a..189d0b831 100644
--- a/math/complex_numbers.cpp
+++ b/math/complex_numbers.cpp
@@ -38,7 +38,7 @@ class Complex {
      */
     Complex() {
         this->re = 0.0;
-        this.im = 0.0;
+        this->im = 0.0;
     }
 
     /**