diff --git a/liberty/LibertyReader.cc b/liberty/LibertyReader.cc
index e3bd11c0..a17bf61f 100644
--- a/liberty/LibertyReader.cc
+++ b/liberty/LibertyReader.cc
@@ -3317,21 +3317,28 @@ LibertyReader::visitShifts(LibertyAttr *attr)
 {
   if (generated_clock_) {
     if (!attr->isComplex()) {
-      libError(1234, attr, "'shifts' attribute is not a complex attribute.");
+      libError(1234, attr, "'shifts' attribute must be a complex attribute.");
     }
     // Initialize edges sequence
     FloatSeq *shifts = new FloatSeq;
     LibertyAttrValueIterator value_iter(attr->values());
     while (value_iter.hasNext()) {
       LibertyAttrValue *value = value_iter.next();
-      if (!value->isFloat()) {
+      // Convert string to float if necessary
+      if (value->isFloat()) {
+        float float_value = value->floatValue();
+        shifts->push_back(float_value);
+      }
+      else if (value->isString()) {
+        const char *string_value = value->stringValue();
+        float float_value = strtof(string_value, nullptr);
+        shifts->push_back(float_value);
+      }
+      else {
         delete shifts;
-        libError(1234, attr, "shifts attribute must be a float.");
+        libError(1234, attr, "shifts attribute must be a float or string.");
       }
-      float float_value = value->floatValue();
-      shifts->push_back(float_value);
     }
-
     // Error checking, only size 3 is supported at the moment
     if (shifts->size() != 3) {
       delete shifts;
@@ -3350,22 +3357,30 @@ LibertyReader::visitEdges(LibertyAttr *attr)
 {
   if (generated_clock_) {
     if (!attr->isComplex()) {
-      libError(1234, attr, "'edges' attribute is not a complex attribute.");
+      libError(1234, attr, "'edges' attribute must be a complex attribute.");
     }
     // Initialize edges sequence
     IntSeq *edges = new IntSeq;
     LibertyAttrValueIterator value_iter(attr->values());
     while (value_iter.hasNext()) {
       LibertyAttrValue *value = value_iter.next();
-      if (!value->isFloat()) {
+      // Convert string to float if necessary
+      if (value->isFloat()) {
+        float float_value = value->floatValue();
+        int int_value = static_cast<int>(float_value);
+        edges->push_back(int_value);
+      }
+      else if (value->isString()) {
+        const char *string_value = value->stringValue();
+        float float_value = strtof(string_value, nullptr);
+        int int_value = static_cast<int>(float_value);
+        edges->push_back(int_value);
+      }
+      else {
         delete edges;
-        libError(1234, attr, "edges attribute must be a float.");
+        libError(1234, attr, "edges attribute must be a float or string.");
       }
-      float float_value = value->floatValue();
-      int int_value = static_cast<int>(float_value);
-      edges->push_back(int_value);
     }
-
     // Error checking, only size 3 is supported at the moment
     if (edges->size() != 3) {
       delete edges;
diff --git a/test/generated_clock.lib b/test/generated_clock.lib
index c9d93ddd..a42490fe 100644
--- a/test/generated_clock.lib
+++ b/test/generated_clock.lib
@@ -53,8 +53,12 @@ library (generated_clock) {
     generated_clock (shift) {
       clock_pin : CLK_OUT    ;
       master_pin : CLK_IN;
-      edges (1, 3, 5);
-      shifts (0, 0, 0)
+      edges("1", \
+          3, \
+          "5");
+      shifts(0, \
+          "0", \
+          0);
     }
     timing () {
       related_pin : CLK_IN;
diff --git a/test/generated_clock.ok b/test/generated_clock.ok
index 797d6104..d0537705 100644
--- a/test/generated_clock.ok
+++ b/test/generated_clock.ok
@@ -1,4 +1,4 @@
-Warning: generated_clock.lib line 57, shifts are not supported yet, may cause malformed waveforms.
+Warning: generated_clock.lib line 59, shifts are not supported yet, may cause malformed waveforms.
 Number of clocks: 9
 clk period: 10.000000
 u_second_hierarchy/clk_gen/CLK_OUT_DIV period: 20.000000