diff --git a/PDP10/ks10_uba.c b/PDP10/ks10_uba.c
index 990cd598..40dde721 100644
--- a/PDP10/ks10_uba.c
+++ b/PDP10/ks10_uba.c
@@ -207,7 +207,7 @@ uba_read_npr(t_addr addr, uint16 ctl, uint64 *data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     *data = M[addr];
     sim_debug(DEBUG_DATA, &cpu_dev, "Rd NPR %08o %08o %012llo\n", oaddr, addr, *data);
     return 1;
@@ -223,7 +223,7 @@ uba_write_npr(t_addr addr, uint16 ctl, uint64 data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     sim_debug(DEBUG_DATA, &cpu_dev, "Wr NPR %08o %08o %012llo\n", oaddr, addr, data);
     M[addr] = data;
     return 1;
@@ -240,7 +240,7 @@ uba_read_npr_byte(t_addr addr, uint16 ctl, uint8 *data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     wd = M[addr];
     sim_debug(DEBUG_DATA, &cpu_dev, "RD NPR B %08o %08o %012llo ", oaddr, addr, wd);
     if ((oaddr & 02) == 0)
@@ -265,7 +265,7 @@ uba_write_npr_byte(t_addr addr, uint16 ctl, uint8 data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     msk = 0377;
     buf = (uint64)(data & msk);
     wd = M[addr];
@@ -296,7 +296,7 @@ uba_read_npr_word(t_addr addr, uint16 ctl, uint16 *data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     wd = M[addr];
     sim_debug(DEBUG_DATA, &cpu_dev, "RD NPR W %08o %08o %012llo m=%o\n", oaddr, addr, wd, map);
     if ((oaddr & 02) == 0)
@@ -318,7 +318,7 @@ uba_write_npr_word(t_addr addr, uint16 ctl, uint16 data)
         return 0;
     if ((map & MAP_VALID) == 0)
         return 0;
-    addr = (map & PAGE_MASK) | (addr >> 2) & 0777;
+    addr = (map & PAGE_MASK) | ((addr >> 2) & 0777);
     msk = 0177777;
     buf = (uint64)(data & msk);
     wd = M[addr];
diff --git a/PDP10/kx10_cpu.c b/PDP10/kx10_cpu.c
index 59de12e4..c8970f36 100644
--- a/PDP10/kx10_cpu.c
+++ b/PDP10/kx10_cpu.c
@@ -4930,7 +4930,7 @@ unasign:
                   MB = SMASK|BIT2|
                        ((uint64)(fm_sel & 0160) << 23) |
                        ((uint64)(prev_ctx & 0160) << 20) |
-                       ub_ptr & 03777777;
+                       (ub_ptr & 03777777);
                   Mem_write_nopage();
 #endif
               }