diff --git a/slsDetectorSoftware/src/Pattern.cpp b/slsDetectorSoftware/src/Pattern.cpp
index 4592c06f0..c51fe726b 100644
--- a/slsDetectorSoftware/src/Pattern.cpp
+++ b/slsDetectorSoftware/src/Pattern.cpp
@@ -9,7 +9,15 @@
 
 namespace sls {
 
-Pattern::Pattern() = default;
+Pattern::Pattern() {
+    // initialize pattern addresses
+     for (int i = 0; i != MAX_PATTERN_LEVELS; ++i) {
+        pat->startloop[i] = MAX_PATTERN_LENGTH - 1;
+        pat->stoploop[i] = MAX_PATTERN_LENGTH - 1;
+        pat->wait[i] = MAX_PATTERN_LENGTH - 1;
+    }   
+}
+
 Pattern::~Pattern() { delete pat; }
 
 Pattern::Pattern(const Pattern &other) {