diff --git a/slsDetectorSoftware/include/sls/Pattern.h b/slsDetectorSoftware/include/sls/Pattern.h
index bea7e82bd..7f435ba54 100644
--- a/slsDetectorSoftware/include/sls/Pattern.h
+++ b/slsDetectorSoftware/include/sls/Pattern.h
@@ -7,8 +7,7 @@ namespace sls {
 #endif
 
 // Common C/C++ structure to handle pattern data
-// typedef struct __attribute__((packed)) {
-typedef struct {
+typedef struct __attribute__((packed)) {
     uint64_t word[MAX_PATTERN_LENGTH];
     uint64_t ioctrl;
     uint32_t limits[2];