diff --git a/src/spicelib/devices/isrc/isrcdest.c b/src/spicelib/devices/isrc/isrcdest.c
index 1f4b9c17b..573d48ce2 100644
--- a/src/spicelib/devices/isrc/isrcdest.c
+++ b/src/spicelib/devices/isrc/isrcdest.c
@@ -24,7 +24,10 @@ ISRCdestroy(GENmodel **inModel)
         oldmod = mod;
         prev = NULL;
         for(here = mod->ISRCinstances ; here ; here = here->ISRCnextInstance) {
-            if(prev) FREE(prev);
+            if(prev) {
+                tfree(prev->ISRCcoeffs);
+                FREE(prev);
+            }
             prev = here;
         }
         if(prev) FREE(prev);
diff --git a/src/spicelib/devices/vsrc/vsrcdest.c b/src/spicelib/devices/vsrc/vsrcdest.c
index 0d2054b47..3a8334b3b 100644
--- a/src/spicelib/devices/vsrc/vsrcdest.c
+++ b/src/spicelib/devices/vsrc/vsrcdest.c
@@ -24,7 +24,10 @@ VSRCdestroy(GENmodel **inModel)
         oldmod = mod;
         prev = NULL;
         for(here = mod->VSRCinstances ; here ; here = here->VSRCnextInstance) {
-            if(prev) FREE(prev);
+            if(prev) {
+                tfree(prev->VSRCcoeffs);
+                FREE(prev);
+            }
             prev = here;
         }
         if(prev) FREE(prev);