diff --git a/src/spicelib/parser/inpptree.c b/src/spicelib/parser/inpptree.c
index 38fc29407..39eb44572 100644
--- a/src/spicelib/parser/inpptree.c
+++ b/src/spicelib/parser/inpptree.c
@@ -778,7 +778,7 @@ static INPparseNode *mkbnode(int opnum, INPparseNode * arg1,
 static INPparseNode *prepare_PTF_PWL(INPparseNode *p)
 {
     INPparseNode *w;
-    struct pwldata { int n; double vals[0]; } *data;
+    struct pwldata { int n; double *vals; } *data;
     int i;
 
     if (p->funcnum != PTF_PWL) {
diff --git a/src/spicelib/parser/ptfuncs.c b/src/spicelib/parser/ptfuncs.c
index 5ea2f8e61..6bf767a64 100644
--- a/src/spicelib/parser/ptfuncs.c
+++ b/src/spicelib/parser/ptfuncs.c
@@ -247,7 +247,7 @@ PTuminus(double arg)
 double
 PTpwl(double arg, void *data)
 {
-  struct pwldata { int n; double vals[0]; } *thing = data;
+  struct pwldata { int n; double *vals; } *thing = data;
 
   double y;
 
@@ -272,7 +272,7 @@ PTpwl(double arg, void *data)
 double
 PTpwl_derivative(double arg, void *data)
 {
-  struct pwldata { int n; double vals[0]; } *thing = data;
+  struct pwldata { int n; double *vals; } *thing = data;
 
   double y;