diff --git a/scripts/generate_psa_constants.py b/scripts/generate_psa_constants.py
index 85bfe3a..7e4420b 100755
--- a/scripts/generate_psa_constants.py
+++ b/scripts/generate_psa_constants.py
@@ -44,7 +44,7 @@
         break;
     }
     buffer[0] = 0;
-    return required_size;
+    return (int) required_size;
 }
 
 static int psa_snprint_algorithm(char *buffer, size_t buffer_size,
@@ -84,7 +84,7 @@
         append(&buffer, buffer_size, &required_size, ")", 1);
     }
     buffer[0] = 0;
-    return required_size;
+    return (int) required_size;
 }
 
 static int psa_snprint_key_usage(char *buffer, size_t buffer_size,
@@ -110,7 +110,7 @@
     } else {
         buffer[0] = 0;
     }
-    return required_size;
+    return (int) required_size;
 }
 
 /* End of automatically generated file. */