diff --git a/include/util.h b/include/util.h
index 437411b6..c7209061 100644
--- a/include/util.h
+++ b/include/util.h
@@ -25,7 +25,7 @@
                         for (int cols = 0; cols < (workspace)->cols; cols++) \
                                 for (int rows = 0; rows < (workspace)->rows; rows++)
 #define FREE(pointer) do { \
-        if (pointer == NULL) { \
+        if (pointer != NULL) { \
                 free(pointer); \
                 pointer = NULL; \
         } \