diff --git a/src/device.c b/src/device.c
index 9693a6b..711d4e7 100644
--- a/src/device.c
+++ b/src/device.c
@@ -30,6 +30,7 @@ void freeDevMem(device_mem_t* devMem)
     free(devMem->memwriteCellSegments);
     free(devMem->memwriteValues[0]);
     free(devMem->memwriteValues);
+    free(devMem->memwriteWordLengths);
     free(devMem->cells);
     free(devMem->smartAddrReadHandlers);
     free(devMem->smartAddrWriteHandlers);
@@ -207,6 +208,23 @@ device_mem_t* genDevMem(device_specs_t* devSpec, char* errbuf)
         memwriteValues[i] = &memwriteValuesContainers[i];
     }
 
+    uint8_t* memwriteWordLengths = calloc(MEM_ACCESS_INTERCEPT_BUF_SIZE, sizeof(uint8_t));
+    if(memwriteWordLengths == NULL)
+    {
+        sprintf(errbuf, "unable to allocate write interception addrs");
+        free(devMem->memsegShifts);
+        free(devMem);
+        free(rawCells);
+        free(memreadCellAddrs);
+        free(cells);
+        free(cellNames);
+        free(memwriteCellAddrs);
+        free(memwriteCellSegments);
+        free(memwriteValues);
+        free(memwriteValuesContainers);
+        return NULL;
+    }
+
     uint64_t smartAddrReadMask = 0;
     uint64_t smartAddrWriteMask = 0;
     mem_h_read_handler* smartAddrReadHandlers = calloc(memTotalSize, sizeof(mem_h_read_handler));
@@ -225,6 +243,7 @@ device_mem_t* genDevMem(device_specs_t* devSpec, char* errbuf)
         free(memwriteCellSegments);
         free(memwriteValues);
         free(memwriteValuesContainers);
+        free(memwriteWordLengths);
         return NULL;
     }
 
@@ -245,6 +264,7 @@ device_mem_t* genDevMem(device_specs_t* devSpec, char* errbuf)
         free(memwriteCellSegments);
         free(memwriteValues);
         free(memwriteValuesContainers);
+        free(memwriteWordLengths);
         return NULL;
     }
 
@@ -316,6 +336,7 @@ device_mem_t* genDevMem(device_specs_t* devSpec, char* errbuf)
     devMem->memreadCellAddrs = memreadCellAddrs;
     devMem->memwriteCellAddrs = memwriteCellAddrs;
     devMem->memwriteCellSegments = memwriteCellSegments;
+    devMem->memwriteWordLengths = memwriteWordLengths;
     devMem->memwriteValues = memwriteValues;
     devMem->memreadLen = 0;
     devMem->memwriteLen = 0;