diff --git a/NEWS b/NEWS
index fa0e23ae..f5ef2adc 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,7 @@ procps-ng-NEXT
   * top: fix argument parsing quirk resulting in SEGV      Redhat #1450429
   * top: delay interval accepts non-locale radix point     Redhat #1182248
   * top: address a wishlist man page NLS suggestion        Debian #865689
+  * top: fix potential distortion in 'Mem' graph display   issue #64
   * watch: define HOST_NAME_MAX where not defined          Debian #830734
 
 procps-ng-3.3.12
diff --git a/top/top.c b/top/top.c
index 25c12464..2439b8b3 100644
--- a/top/top.c
+++ b/top/top.c
@@ -4807,21 +4807,26 @@ numa_nope:
             { "%-.*s~4", "%-.*s~6", "%-.*s~6", Graph_blks }
          };
          char used[SMLBUFSIZ], util[SMLBUFSIZ], dual[MEDBUFSIZ];
-         int ix = w->rc.graph_mems - 1;
-         float pct_used = (float)MEM_VAL(mem_USE) * (100.0 / (float)MEM_VAL(mem_TOT)),
+         float pct_used, pct_misc, pct_swap;
+         int ix, num_used, num_misc;
+
+         pct_used = (float)MEM_VAL(mem_USE) * (100.0 / (float)MEM_VAL(mem_TOT));
 #ifdef MEMGRAPH_OLD
-               pct_misc = (float)(MEM_VAL(mem_BUF) + MEM_VAL(mem_QUE)) * (100.0 / (float)MEM_VAL(mem_TOT)),
+         pct_misc = (float)(MEM_VAL(mem_BUF) + MEM_VAL(mem_QUE)) * (100.0 / (float)MEM_VAL(mem_TOT));
 #else
-               pct_misc = (float)(MEM_VAL(mem_TOT) - MEM_VAL(mem_AVL) - MEM_VAL(mem_USE)) * (100.0 / (float)MEM_VAL(mem_TOT)),
+         pct_misc = (float)(MEM_VAL(mem_TOT) - MEM_VAL(mem_AVL) - MEM_VAL(mem_USE)) * (100.0 / (float)MEM_VAL(mem_TOT));
 #endif
-               pct_swap = MEM_VAL(swp_TOT) ? (float)MEM_VAL(swp_USE) * (100.0 / (float)MEM_VAL(swp_TOT)) : 0;
+         if (pct_used + pct_misc > 100.0 || pct_misc < 0) pct_misc = 0;
+         pct_swap = MEM_VAL(swp_TOT) ? (float)MEM_VAL(swp_USE) * (100.0 / (float)MEM_VAL(swp_TOT)) : 0;
+         ix = w->rc.graph_mems - 1;
 #ifndef QUICK_GRAPHS
-         int num_used = (int)((pct_used * Graph_adj) + .5),
-             num_misc = (int)((pct_misc * Graph_adj) + .5);
+         num_used = (int)((pct_used * Graph_adj) + .5),
+         num_misc = (int)((pct_misc * Graph_adj) + .5);
          if (num_used + num_misc > Graph_len) num_misc = Graph_len - num_used;
          snprintf(used, sizeof(used), gtab[ix].used, num_used, gtab[ix].type);
          snprintf(util, sizeof(util), gtab[ix].misc, num_misc, gtab[ix].type);
 #else
+         (void)num_used; (void)num_misc;
          snprintf(used, sizeof(used), gtab[ix].used, (int)((pct_used * Graph_adj) + .5), gtab[ix].type);
          snprintf(util, sizeof(util), gtab[ix].misc, (int)((pct_misc * Graph_adj) + .4), gtab[ix].type);
 #endif