diff --git a/DESCRIPTION b/DESCRIPTION
index 66a083d6..24c238ed 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
 Package: effectsize
 Title: Indices of Effect Size
-Version: 1.0.2
+Version: 1.0.2.0000001
 Authors@R:
     c(person(given = "Mattan S.",
              family = "Ben-Shachar",
diff --git a/NEWS.md b/NEWS.md
index efd09c2d..b2bc1d60 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# effectsize 1.0.x
+
+## Bug fixes
+
+- `eta_squared(<afex> / <Anova.mlm>)` with partially overlapping factor names now return correct effect sizes ( #697 )
+
 # effectsize 1.0.2
 
 ## New features
diff --git a/R/eta_squared-methods.R b/R/eta_squared-methods.R
index 0f3969c5..35fd804f 100644
--- a/R/eta_squared-methods.R
+++ b/R/eta_squared-methods.R
@@ -152,7 +152,7 @@
     within_subj <- sapply(within_subj, paste, collapse = ":")
     within_subj <- within_subj[order(ns)]
     within_subj <- Filter(function(x) nzchar(x, keepNA = TRUE), within_subj)
-    l <- sapply(within_subj, grepl, x = aov_tab$Parameter, simplify = TRUE)
+    l <- sapply(paste0("\\b", within_subj, "\\b"), grepl, x = aov_tab$Parameter, simplify = TRUE)
     l <- apply(l, 1, function(x) if (any(x)) max(which(x)) else 0)
     l <- c(NA, within_subj)[l + 1]
     l <- sapply(l, function(x) paste0(stats::na.omit(c(id, x)), collapse = ":"))
diff --git a/tests/testthat/test-eta_squared.R b/tests/testthat/test-eta_squared.R
index 104176af..0147d8e1 100644
--- a/tests/testthat/test-eta_squared.R
+++ b/tests/testthat/test-eta_squared.R
@@ -779,6 +779,53 @@ test_that("Anova.mlm Manova", {
   expect_equal(A1[c(2:4, 6:7), ], A2[c(2:4, 6:7), -1], ignore_attr = TRUE)
 })
 
+test_that("Anova.mlm / afex | overlapping factor names", {
+  skip_if_not_installed("car")
+  skip_if_not_installed("afex")
+
+  data <- data.frame(
+    subject = c(1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 9L, 10L, 9L, 10L, 9L, 10L, 9L, 10L),
+    XBlock = factor(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), labels = c("a1", "a2")),
+    Block = factor(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L), labels = c("aa1", "aa2")),
+    C = factor(c(1L, 1L, 2L, 2L, 1L, 1L, 2L, 2L, 1L, 1L, 2L, 2L, 1L, 1L, 2L, 2L), labels = c("C_c1", "C_c2")),
+    y = c(-0.09, -0.29, 0.13, 0.06, 0.17, -0.01, 0.07, 0.27, 0.05, -0.01, -0.07, -0.05, 0.15, 0.12, 0.09, 0.26)
+  )
+  contrasts(data$XBlock) <- contr.sum
+  data$X <- data$XBlock
+
+
+  # list partial eta_squared:
+  aov_overlap <- afex::aov_ez(
+    "subject", "y", data,
+    between = "XBlock",
+    within = c("Block", "C"),
+    anova_table = list(es = "pes")
+  )
+
+  aov_nooverlap <- afex::aov_ez(
+    "subject", "y", data,
+    between = "X",
+    within = c("Block", "C"),
+    anova_table = list(es = "pes")
+  )
+
+  expect_equal(
+    aov_overlap$anova_table$pes,
+    eta_squared(aov_overlap)$Eta2_partial
+  )
+
+  expect_equal(
+    eta_squared(aov_overlap)$Eta2_partial,
+    eta_squared(aov_nooverlap)$Eta2_partial
+  )
+
+  expect_equal(
+    eta_squared(aov_overlap)$Eta2_partial,
+    eta_squared(aov_overlap$Anova)$Eta2_partial
+  )
+})
+
+
 ## merMod --------------------
 
 test_that("merMod and lmerModLmerTest", {