diff --git a/src/libCom/cvtFast.c b/src/libCom/cvtFast.c
index d8ba6f812..dee0e93dc 100644
--- a/src/libCom/cvtFast.c
+++ b/src/libCom/cvtFast.c
@@ -48,6 +48,10 @@
  *				Also they are not used on vxWorks
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <limits.h>		/* XPG2/XPG3/POSIX.1/FIPS151-1/ANSI-C */
diff --git a/src/libCom/cvtFast/cvtFast.c b/src/libCom/cvtFast/cvtFast.c
index d8ba6f812..dee0e93dc 100644
--- a/src/libCom/cvtFast/cvtFast.c
+++ b/src/libCom/cvtFast/cvtFast.c
@@ -48,6 +48,10 @@
  *				Also they are not used on vxWorks
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <limits.h>		/* XPG2/XPG3/POSIX.1/FIPS151-1/ANSI-C */
diff --git a/src/libCom/ellLib.c b/src/libCom/ellLib.c
index aaa286d87..f82160d73 100644
--- a/src/libCom/ellLib.c
+++ b/src/libCom/ellLib.c
@@ -32,6 +32,10 @@
 
 /* #define	DEBUG_DRIVER */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <stdlib.h>
 
 #include <ellLib.h>
diff --git a/src/libCom/ellLib/ellLib.c b/src/libCom/ellLib/ellLib.c
index aaa286d87..f82160d73 100644
--- a/src/libCom/ellLib/ellLib.c
+++ b/src/libCom/ellLib/ellLib.c
@@ -32,6 +32,10 @@
 
 /* #define	DEBUG_DRIVER */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <stdlib.h>
 
 #include <ellLib.h>
diff --git a/src/libCom/freeList/freeListLib.c b/src/libCom/freeList/freeListLib.c
index 7597fce64..e0b686fba 100644
--- a/src/libCom/freeList/freeListLib.c
+++ b/src/libCom/freeList/freeListLib.c
@@ -51,6 +51,10 @@ DEVELOPMENT CENTER AT ARGONNE NATIONAL LABORATORY (708-252-2000).
  * .01  04-19-94	mrk	Initial Implementation
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <string.h>
 #include <stdlib.h>
 #include <stddef.h>
diff --git a/src/libCom/freeListLib.c b/src/libCom/freeListLib.c
index 7597fce64..e0b686fba 100644
--- a/src/libCom/freeListLib.c
+++ b/src/libCom/freeListLib.c
@@ -51,6 +51,10 @@ DEVELOPMENT CENTER AT ARGONNE NATIONAL LABORATORY (708-252-2000).
  * .01  04-19-94	mrk	Initial Implementation
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <string.h>
 #include <stdlib.h>
 #include <stddef.h>
diff --git a/src/libCom/gpHash/gpHashLib.c b/src/libCom/gpHash/gpHashLib.c
index 5f94dc666..2a9ab7683 100644
--- a/src/libCom/gpHash/gpHashLib.c
+++ b/src/libCom/gpHash/gpHashLib.c
@@ -51,6 +51,10 @@ DEVELOPMENT CENTER AT ARGONNE NATIONAL LABORATORY (708-252-2000).
  * .01  04-07-94	mrk	Initial Implementation
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <dbDefs.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/src/libCom/gpHashLib.c b/src/libCom/gpHashLib.c
index 5f94dc666..2a9ab7683 100644
--- a/src/libCom/gpHashLib.c
+++ b/src/libCom/gpHashLib.c
@@ -51,6 +51,10 @@ DEVELOPMENT CENTER AT ARGONNE NATIONAL LABORATORY (708-252-2000).
  * .01  04-07-94	mrk	Initial Implementation
  */
 
+#ifdef vxWorks
+#include <vxWorks.h>
+#endif
+
 #include <dbDefs.h>
 #include <string.h>
 #include <stdlib.h>