diff --git a/reactos/hal/halx86/generic/usage.c b/reactos/hal/halx86/generic/usage.c
index e2d967d8498..6bfbc8328aa 100644
--- a/reactos/hal/halx86/generic/usage.c
+++ b/reactos/hal/halx86/generic/usage.c
@@ -323,7 +323,7 @@ HalpReportResourceUsage(IN PUNICODE_STRING HalName,
         while (TRUE)
         {
             /* Check for valid vector number */
-            if (i <= MAXIMUM_IDTVECTOR)
+            if (i < MAXIMUM_IDTVECTOR)
             {
                 /* Check if this entry should be parsed */
                 if ((HalpIDTUsageFlags[i].Flags & FlagMatch))
diff --git a/reactos/hal/halx86/legacy/bussupp.c b/reactos/hal/halx86/legacy/bussupp.c
index 76aca8c098a..e682989d591 100644
--- a/reactos/hal/halx86/legacy/bussupp.c
+++ b/reactos/hal/halx86/legacy/bussupp.c
@@ -721,7 +721,7 @@ HalpDebugPciDumpBus(IN ULONG i,
             SubClassName += 5;
             p = strchr(SubClassName, '\r');
             Length = p - SubClassName;
-            if (Length > sizeof(bSubClassName)) Length = sizeof(bSubClassName);
+            if (Length > sizeof(bSubClassName)) Length = sizeof(bSubClassName) - 1;
             strncpy(bSubClassName, SubClassName, Length);
             bSubClassName[Length] = '\0';
         }