diff --git a/Intel-Systems/common/isbc201.c b/Intel-Systems/common/isbc201.c
index 8559aeea..1a5fb36f 100644
--- a/Intel-Systems/common/isbc201.c
+++ b/Intel-Systems/common/isbc201.c
@@ -388,7 +388,7 @@ t_stat isbc201_attach (UNIT *uptr, CONST char *cptr)
             fdc201[fdcnum].fdd[fddnum].buf = (uint8 *)malloc(flen);
             if (fdc201[fdcnum].fdd[fddnum].buf == NULL) {
                 sim_printf("   isbc201_attach: Malloc error\n");
-                free(fp);
+                fclose(fp);
                 return SCPE_MEM;
             }
         }
diff --git a/Intel-Systems/common/isbc202.c b/Intel-Systems/common/isbc202.c
index d3e80b34..5dfd6d8c 100644
--- a/Intel-Systems/common/isbc202.c
+++ b/Intel-Systems/common/isbc202.c
@@ -401,7 +401,7 @@ t_stat isbc202_attach (UNIT *uptr, CONST char *cptr)
             fdc202[fdcnum].fdd[fddnum].buf = (uint8 *)malloc(flen);
             if (fdc202[fdcnum].fdd[fddnum].buf == NULL) {
                 sim_printf("   isbc202_attach: Malloc error\n");
-                free(fp);
+                fclose(fp);
                 return SCPE_MEM;
             }
         }
diff --git a/Intel-Systems/common/isbc208.c b/Intel-Systems/common/isbc208.c
index e0b9e68c..ce205d62 100644
--- a/Intel-Systems/common/isbc208.c
+++ b/Intel-Systems/common/isbc208.c
@@ -1073,7 +1073,7 @@ t_stat isbc208_attach (UNIT *uptr, CONST char *cptr)
             isbc208_buf[uptr->u6] = (uint8 *)malloc(flen);
             if (isbc208_buf[uptr->u6] == NULL) {
                 sim_printf("   iSBC208_attach: Malloc error\n");
-                free(fp);
+                fclose(fp);
                 return SCPE_MEM;
             }
         }
diff --git a/Intel-Systems/common/zx200a.c b/Intel-Systems/common/zx200a.c
index 8dd8fc90..4b3dd720 100644
--- a/Intel-Systems/common/zx200a.c
+++ b/Intel-Systems/common/zx200a.c
@@ -405,7 +405,7 @@ t_stat zx200a_attach (UNIT *uptr, CONST char *cptr)
             zx200a[fdcnum].fdd[fddnum].buf = (uint8 *)malloc(flen);
             if (zx200a[fdcnum].fdd[fddnum].buf == NULL) {
                 sim_printf("   zx200a_attach: Malloc error\n");
-                free(fp);
+                fclose(fp);
                 return SCPE_MEM;
             }
         }