diff --git a/packages/mermaid/src/diagrams/pie/pieDb.ts b/packages/mermaid/src/diagrams/pie/pieDb.ts
index 87735b84e..ade44c331 100644
--- a/packages/mermaid/src/diagrams/pie/pieDb.ts
+++ b/packages/mermaid/src/diagrams/pie/pieDb.ts
@@ -35,15 +35,9 @@ const clear = (): void => {
 
 const addSection = ({ label, value }: D3Section): void => {
   if (value <= 0) {
-    const error: any = new Error(
-      `Section "${label}" has invalid value: ${value}. Zero and negative values are not allowed in pie charts. All slice values must be > 0`
+    throw new Error(
+      `"${label}" has invalid value: ${value}. Zero and negative values are not allowed in pie charts. All slice values must be > 0.`
     );
-    error.hash = {
-      text: `pie "${label}": ${value}`,
-      token: `${value}`,
-      expected: ['a positive number (> 0)'],
-    };
-    throw error;
   }
   if (!sections.has(label)) {
     sections.set(label, value);
diff --git a/packages/parser/src/language/common/common.langium b/packages/parser/src/language/common/common.langium
index e6d3d488f..b74ffc34d 100644
--- a/packages/parser/src/language/common/common.langium
+++ b/packages/parser/src/language/common/common.langium
@@ -17,8 +17,8 @@ terminal ACC_DESCR: /[\t ]*accDescr(?:[\t ]*:([^\n\r]*?(?=%%)|[^\n\r]*)|\s*{([^}
 terminal ACC_TITLE: /[\t ]*accTitle[\t ]*:(?:[^\n\r]*?(?=%%)|[^\n\r]*)/;
 terminal TITLE: /[\t ]*title(?:[\t ][^\n\r]*?(?=%%)|[\t ][^\n\r]*|)/;
 
-terminal FLOAT returns number: /-?[0-9]+\.[0-9]+(?!\.)/;
-terminal INT returns number: /-?(0|[1-9][0-9]*)(?!\.)/;
+terminal FLOAT returns number: /[0-9]+\.[0-9]+(?!\.)/;
+terminal INT returns number: /0|[1-9][0-9]*(?!\.)/;
 terminal NUMBER returns number: FLOAT | INT;
 
 terminal STRING returns string: /"([^"\\]|\\.)*"|'([^'\\]|\\.)*'/;
diff --git a/packages/parser/src/language/pie/pie.langium b/packages/parser/src/language/pie/pie.langium
index a80caa81f..f6802d718 100644
--- a/packages/parser/src/language/pie/pie.langium
+++ b/packages/parser/src/language/pie/pie.langium
@@ -12,5 +12,9 @@ entry Pie:
 ;
 
 PieSection:
-  label=STRING ":" value=NUMBER EOL
+  label=STRING ":" value=NUMBER_PIE EOL
 ;
+
+terminal FLOAT_PIE returns number: /-?[0-9]+\.[0-9]+(?!\.)/;
+terminal INT_PIE returns number: /-?(0|[1-9][0-9]*)(?!\.)/;
+terminal NUMBER_PIE returns number: FLOAT_PIE |  INT_PIE;
\ No newline at end of file