diff --git a/src/strings.cpp b/src/strings.cpp
index a0f1387972..65bde033fe 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -1140,6 +1140,7 @@ static void FormatString(StringBuilder &builder, const char *str_arg, StringPara
 				} else {
 					StringParameters sub_args(args, size);
 					GetStringWithArgs(builder, string_id, sub_args, next_substr_case_index, game_script);
+					args.AdvanceOffset(size);
 				}
 				next_substr_case_index = 0;
 				break;
diff --git a/src/strings_internal.h b/src/strings_internal.h
index a0154c3b21..b7e521cc2b 100644
--- a/src/strings_internal.h
+++ b/src/strings_internal.h
@@ -39,20 +39,13 @@ protected:
 public:
 	/**
 	 * Create a new StringParameters instance that can reference part of the data of
-	 * the given partent instance.
+	 * the given parent instance.
 	 */
 	StringParameters(StringParameters &parent, size_t size) :
 		parent(&parent),
 		parameters(parent.parameters.subspan(parent.offset, size))
 	{}
 
-	~StringParameters()
-	{
-		if (this->parent != nullptr) {
-			this->parent->offset += this->parameters.size();
-		}
-	}
-
 	void PrepareForNextRun();
 	void SetTypeOfNextParameter(char32_t type) { this->next_type = type; }
 
@@ -81,6 +74,17 @@ public:
 		this->offset = offset;
 	}
 
+	/**
+	 * Advance the offset within the string from where to return the next result of
+	 * \c GetInt64 or \c GetInt32.
+	 * @param advance The amount to advance the offset by.
+	 */
+	void AdvanceOffset(size_t advance)
+	{
+		this->offset += advance;
+		assert(this->offset <= this->parameters.size());
+	}
+
 	/**
 	 * Get the next parameter from our parameters.
 	 * This updates the offset, so the next time this is called the next parameter