diff --git a/src/internals.h b/src/internals.h
index 8effe1d..73770f9 100644
--- a/src/internals.h
+++ b/src/internals.h
@@ -39,8 +39,12 @@
 #define NTS		4
 #define	SMIN	1.e-3
 
-/* Replaces the "10000" limit used to identiy segment/patch connections */
-#define	PCHCON  10000
+/*
+ * Keep the patch-connection namespace above practical wire-segment counts.
+ * PCHCON is used to distinguish patch connections from ordinary segment
+ * connections, so it must not overlap valid generated segment numbers.
+ */
+#define PCHCON  1000000000
 
 /* carriage return and line feed */
 #define	CR	0x0d
diff --git a/src/reporting.c b/src/reporting.c
index 2eebf08..a9c0020 100644
--- a/src/reporting.c
+++ b/src/reporting.c
@@ -880,11 +880,17 @@ static int process_ex_card(context_t *ctx, const card_t *card, card_state_t *sta
         if (cabs(voltage) < 1e-20) {
             voltage = 1.0 + 0.0*I;  /* Default to 1 volt */
         }
-        
+
+        /*
+         * EX specifies a segment relative to its tag, but the queued source is
+         * subsequently processed using an absolute/global segment number.
+         */
+        int global_seg = segment_number(ctx, tag, seg);
+
         if (extype == 0) {
-            return add_voltage_source(ctx, tag, seg, voltage);
+            return add_voltage_source(ctx, tag, global_seg, voltage);
         } else {
-            return add_current_source(ctx, tag, seg, voltage);
+            return add_current_source(ctx, tag, global_seg, voltage);
         }
     }
     else if (extype >= 1 && extype <= 4) {