diff --git a/src/memory.rs b/src/memory.rs
index 385f5d0..f9d3cfc 100644
--- a/src/memory.rs
+++ b/src/memory.rs
@@ -113,13 +113,17 @@ impl MemoryInstance {
             let initial_u32: u32 = initial
                 .0
                 .try_into()
-                .map_err(|_| Error::Memory("initial can't be coerced to u32".into()))?;
+                .map_err(|_| Error::Memory(format!("initial ({}) can't be coerced to u32", initial.0)))?;
             let maximum_u32: Option<u32> = match maximum {
-                Some(pages) => Some(
-                    pages
+                Some(maximum_pages) => Some(
+                    maximum_pages
                         .0
                         .try_into()
-                        .map_err(|_| Error::Memory("maximum can't be coerced to u32".into()))?,
+                        .map_err(|_|
+                            Error::Memory(
+                                format!("maximum ({}) can't be coerced to u32", maximum_pages.0)
+                            )
+                        )?,
                 ),
                 None => None,
             };