diff --git a/src/spicelib/devices/isrc/isrcdest.c b/src/spicelib/devices/isrc/isrcdest.c
index 1f4b9c17b..849da4695 100644
--- a/src/spicelib/devices/isrc/isrcdest.c
+++ b/src/spicelib/devices/isrc/isrcdest.c
@@ -24,6 +24,8 @@ ISRCdestroy(GENmodel **inModel)
         oldmod = mod;
         prev = NULL;
         for(here = mod->ISRCinstances ; here ; here = here->ISRCnextInstance) {
+            tfree(here->ISRCcoeffs);
+            tfree(here->ISRC_state);
             if(prev) FREE(prev);
             prev = here;
         }
diff --git a/src/spicelib/devices/vsrc/vsrcdest.c b/src/spicelib/devices/vsrc/vsrcdest.c
index 0d2054b47..0f469a141 100644
--- a/src/spicelib/devices/vsrc/vsrcdest.c
+++ b/src/spicelib/devices/vsrc/vsrcdest.c
@@ -24,6 +24,8 @@ VSRCdestroy(GENmodel **inModel)
         oldmod = mod;
         prev = NULL;
         for(here = mod->VSRCinstances ; here ; here = here->VSRCnextInstance) {
+            tfree(here->VSRCcoeffs);
+            tfree(here->VSRC_state);
             if(prev) FREE(prev);
             prev = here;
         }