diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0f34ee90..ed13c6370 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Zowe Common C Changelog
 
+## `2.18.1`
+- Bugfix: IARV64 results must be checked for 0x7FFFF000 (#474)
+
 ## `2.18.0`
 - Minor `components.zss.logLevels._zss.httpserver=5` debug messages enhancement (#471)
 
diff --git a/c/alloc.c b/c/alloc.c
index 33742901a..b75b2fecf 100644
--- a/c/alloc.c
+++ b/c/alloc.c
@@ -181,7 +181,12 @@ static char* __ptr64 getmain64(long long sizeInMegabytes, int *returnCode, int *
 
    if (returnCode) *returnCode = macroRetCode;
    if (reasonCode) *reasonCode = macroResCode;
-  
+
+  // IARV64 returns 0x7FFFF000 when MEMLIMIT is reached
+  if (data == (void *)0x7FFFF000) {
+    data = NULL;
+  }
+
    return data;
 
 }
@@ -202,7 +207,12 @@ static char* __ptr64 getmain64ByToken(long long sizeInMegabytes, long long token
 
   if (returnCode) *returnCode = macroRetCode;
   if (reasonCode) *reasonCode = macroResCode;
-  
+
+  // IARV64 returns 0x7FFFF000 when MEMLIMIT is reached
+  if (data == (void *)0x7FFFF000) {
+    data = NULL;
+  }
+
   return data;
   
 }