diff --git a/pdfplumber/table.py b/pdfplumber/table.py
index 9101636f..a6e3fcb5 100644
--- a/pdfplumber/table.py
+++ b/pdfplumber/table.py
@@ -486,8 +486,8 @@ def get_edges(self):
             else:
                 v_explicit.append(
                     {
-                        "x0": desc,
-                        "x1": desc,
+                        "x0": utils.decimalize(desc),
+                        "x1": utils.decimalize(desc),
                         "top": self.page.bbox[1],
                         "bottom": self.page.bbox[3],
                         "height": self.page.bbox[3] - self.page.bbox[1],
@@ -520,8 +520,8 @@ def get_edges(self):
                         "x0": self.page.bbox[0],
                         "x1": self.page.bbox[2],
                         "width": self.page.bbox[2] - self.page.bbox[0],
-                        "top": desc,
-                        "bottom": desc,
+                        "top": utils.decimalize(desc),
+                        "bottom": utils.decimalize(desc),
                         "orientation": "h",
                     }
                 )
diff --git a/tests/test_table.py b/tests/test_table.py
index 114582c9..ebca754e 100644
--- a/tests/test_table.py
+++ b/tests/test_table.py
@@ -60,6 +60,18 @@ def test_edges_strict(self):
             ""
         ]
 
+    def test_explicit_desc_decimalization(self):
+        """
+        See issue #290
+        """
+        tf = table.TableFinder(self.pdf.pages[0], {
+            "vertical_strategy": "explicit",
+            "explicit_vertical_lines": [ 100, 200, 300 ],
+            "horizontal_strategy": "explicit",
+            "explicit_horizontal_lines": [ 100, 200, 300 ],
+        })
+        assert tf.tables[0].extract()
+
     def test_text_without_words(self):
         assert table.words_to_edges_h([]) == []
         assert table.words_to_edges_v([]) == []